Seresto Pet Collar Poisoning May Have Caused Nearly 1,700 Pet Deaths, Hundreds of Human Injuries

A popular flea and tick pet collar may have caused hundreds of animal deaths and nearly 1,000 adverse health reactions in humans, according to an investigative report, which calls on federal regulators to take action and remove Seresto pet collars from store shelves to prevent additional injuries and deaths.

In findings published this week by USA Today, investigators indicate Bayer’s Seresto flea and tick collars have caused more than 75,000 adverse health reactions among humans and pets since they were first introduced to the market in 2012.

The flea and tick collars are designed to release small amounts of pesticide onto the skin of cats and dogs for months at a time to kill fleas, ticks and other pests. However, the side effects of Seresto collars may include a serious poisoning risk for pets and humans.

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According to federal documents retained through a public records request by the nonprofit organization the Center for Biological Diversity, officials at the Environmental Protection Agency (EPA) know of more than 75,000 incident reports involving problems with Seresto collars, including 1,698 related pet deaths and nearly 1,000 incidents involving harmful human exposures to the pesticides. However, the agency took no actions to address the problem and has not issued any warning, which investigators from USA Today claim is a failure in their regulatory obligations.

In addition to the regulatory oversight, investigators noted numerous complaints filed on Amazon.com, where Seresto is the top-selling collar. The investigation found  complaints from consumers indicating the collars caused pets to develop painful rashes, while some claimed the pesticides caused their pets to suffer neurological issues.

The investigation highlights one report from Rhonda Bomwell, a New Jersey resident who used a Seresto flea and tick collar on her 9-year old papillon service dog, as recommended by the veterinarian. Bomwell reported she purchased the Seresto collar at her local pet store, and within a day of her papillon wearing it, the dog collapsed and began having seizures. The papillon, named Pierre, stopped breathing and died shortly after being rushed to the animal hospital.

Within the thousands of incidents submitted to the EPA, investigators found a series of reports of pesticide exposures which harmed humans as well. One incident involved a 12 year old boy who had to be hospitalized after having seizures and vomiting from exposure to the Seresto collar his dog was wearing.

Another incident involved a 43-year-old man who put Seresto collars on eight of his dogs and slept in the same bed as four of the dogs. Within a week he developed ear drainage and nasal and throat irritation and was told by a doctor that he had a hole in his ear drum. After removing the Seresto collars from his dogs the symptoms went away. He later reapplied the collars and the symptoms returned.

Investigators indicate that under the Federal Insecticide, Fungicide and Rodenticide Act, the EPA is tasked with regulating products that contain pesticides, yet appear to have turned a blind eye to the tens of thousands of human and animal incidents reported over the last seven years.

The Midwest Center for Investigative Reporting, which cosponsored the investigation, said the EPA did not respond to a request about how Seresto compared to other flea and tick collars in terms of incidents. The organization has since filed a Freedom of Information request for the incident database related to Seresto pesticide collars, but says that request has not yet been filled.

108 Comments

  • KellyApril 24, 2023 at 3:54 pm

    My dog has never worn the Seresto collar, however he is regularly around another dog that does. Every time they play together, he ends up getting paralysis and he becomes very lethargic. Even when the other dog doesn’t wear the collar, if she gets wet and they play together he ends up looking like he’s had a stroke. Sometimes it’s an immediate reaction, sometimes it is delayed. We couldn’t correla[Show More]My dog has never worn the Seresto collar, however he is regularly around another dog that does. Every time they play together, he ends up getting paralysis and he becomes very lethargic. Even when the other dog doesn’t wear the collar, if she gets wet and they play together he ends up looking like he’s had a stroke. Sometimes it’s an immediate reaction, sometimes it is delayed. We couldn’t correlate it to the collar for awhile because of the delayed reaction. Most recently, he was exposed again and it happened immediately. These collars are toxic!

  • RichardApril 9, 2023 at 11:10 pm

    My 11yr dog developed paralysis to his back legs and diarrhea within a month of wearing this. Read all the stories here and took it off last night, day 2 of symptoms and hope to god he’s going to be ok!

  • DougFebruary 4, 2023 at 9:32 am

    My Teddy has been wearing one since he was a puppy. He developed an ear infection about 3 years ago, he is six now. They became more frequent as time wore on. When we cleared up one within weeks the next came on. We switched his food but they persisted. I always thought it was water from his baths. About a week ago I bathed him (I took his collar off beforehand.) Being a cold snap, I deci[Show More]My Teddy has been wearing one since he was a puppy. He developed an ear infection about 3 years ago, he is six now. They became more frequent as time wore on. When we cleared up one within weeks the next came on. We switched his food but they persisted. I always thought it was water from his baths. About a week ago I bathed him (I took his collar off beforehand.) Being a cold snap, I decided to leave his collar off. More than a week passed and his ears were normal and healthy, I check them every day due to his persistent problems. I decided he needed his collar so I put it on him. Within hours I noticed his ears were red, By morning, they were scaly and very inflamed. I immediately took the collar off and treated his ears. I use Benedryl in conjunction with his medicine to calm the infection and ease the itch. I think it was the collar all-along.

  • BrandiNovember 9, 2022 at 1:55 pm

    We purchased the Seresto Flea and Tick collar on October 31, 2022 and put on our 11 year old dog. By November 9 she was in liver failure and today we have an appt to lay her to rest as the disease is too far gone…. Mind you at the end of June she was in very good health. How is this collar still on the market !?!?!? :(

  • MariaOctober 31, 2022 at 2:14 am

    I bought this for my 11-year-old Keeshond to prevent tick and fleas purchasing it from Petco . Shortly after using this she started to have seizures that she never had before. All within 10 days she had four grand mall seizures . She was my fur baby and to think how many hearts are broken and this is still selling on store shelves for the greed of money ! Just sickening I had to lose my pet [Show More]I bought this for my 11-year-old Keeshond to prevent tick and fleas purchasing it from Petco . Shortly after using this she started to have seizures that she never had before. All within 10 days she had four grand mall seizures . She was my fur baby and to think how many hearts are broken and this is still selling on store shelves for the greed of money ! Just sickening I had to lose my pet over something that could’ve been totally prevented !

  • ChelsyOctober 23, 2022 at 11:55 pm

    I bought this collar for my 7 year old lab. He is very active and has lots of energy. I put the collar on him and he started laying around and whimpering. His front legs started giving out and he limps. I removed the collar!!

  • ChelsyOctober 23, 2022 at 11:45 pm

    Bought the collar for my 7 year old lab who was very active. After a month of wearing the collar he was laying around and now his front legs give out and buckle under him. He lays a cries in pain. I removed the collar.

  • MaryannOctober 14, 2022 at 8:39 pm

    All I candy is sue the company that makes the dog collar’s

  • JenniferSeptember 25, 2022 at 6:43 pm

    My soon to be 9 year old dog Chevy recently started having seizures. Took him to vet and they done all the blood work and his white blood count was so high it puzzled the doctor. Chevy's blood count was 1800. During his visit at vet also was noticed that he has several lumps all through his body. My sweet and health Chevy will have to have surgery to remove the large lump to be sent off to [Show More]My soon to be 9 year old dog Chevy recently started having seizures. Took him to vet and they done all the blood work and his white blood count was so high it puzzled the doctor. Chevy's blood count was 1800. During his visit at vet also was noticed that he has several lumps all through his body. My sweet and health Chevy will have to have surgery to remove the large lump to be sent off to see if its cancer. I purchased the Seresto collar a few months ago and his health went down hill just like that. Chevy has his regular checkups and results have been great. I do believe the collar has caused Chevy so much health problems within a few months.

  • JudySeptember 10, 2022 at 3:19 pm

    I purchased Seresto collars for my cats in early summer 2022. Within 2 weeks both of my cats died from acute kidney failure. They were both young, healthy, and active. Both cats became ill very soon after the collars were put on them. It was days. As soon as they became ill I removed the collars. They both were under the care of a veterinarian and not only are we dealing with their loss but the ve[Show More]I purchased Seresto collars for my cats in early summer 2022. Within 2 weeks both of my cats died from acute kidney failure. They were both young, healthy, and active. Both cats became ill very soon after the collars were put on them. It was days. As soon as they became ill I removed the collars. They both were under the care of a veterinarian and not only are we dealing with their loss but the veterinarian bills were over $2500. The collars were purchased from a pet care store. These collars killed my cats. Since the death of my cats, I have seen many similar scenarios. I firmly believe these collars are tainted and need recalled

  • AnnieSeptember 5, 2022 at 12:04 am

    I’ll never put one of those collars on my pets again. We have lost two dogs to cancer and one cat, plus, a dog to what the vet thought was DM ( which is neurological problem). Our vet never thought the problems were caused by the Seresto collars. We had to take the collar off our oldest dog because of neck irritation and find something else for her. Her liver enzymes had been elevated and 4 m[Show More]I’ll never put one of those collars on my pets again. We have lost two dogs to cancer and one cat, plus, a dog to what the vet thought was DM ( which is neurological problem). Our vet never thought the problems were caused by the Seresto collars. We had to take the collar off our oldest dog because of neck irritation and find something else for her. Her liver enzymes had been elevated and 4 months after the collar was removed they were back to normal. I believed the hype over the collars being fake ones causing the deaths in dogs and cats but I don’t believe that now.

  • TaraSeptember 1, 2022 at 3:15 am

    I bought Seresto collar for my 13 year old Yorkshire terrier, within hours she was having diarrhea and vomiting, she is very very ill, sees the vet in the am, I was doing my research bc my 12 year old dog Anna died 8/12/2021 a month after I put a Seresto collar on her, and only now am I realizing the poisoning she indured was from the collar, I only realized it bc this was the only thing that was [Show More]I bought Seresto collar for my 13 year old Yorkshire terrier, within hours she was having diarrhea and vomiting, she is very very ill, sees the vet in the am, I was doing my research bc my 12 year old dog Anna died 8/12/2021 a month after I put a Seresto collar on her, and only now am I realizing the poisoning she indured was from the collar, I only realized it bc this was the only thing that was different for my Yorkie, for offer a year we pondered his was Anna at the vet just 2 months earlier, had blood work and had a great report, to diarrhea vomiting and kidney failure one month after purchasing and putting the collar on her, I hope Trixie makes it through the night to get to the vet.

  • KishaAugust 13, 2022 at 5:59 pm

    I had to have my cat put to sleep last week. I'm still a mess over it. His breathing was extremely labored and he lost weight, took him to the vet his temp was only 97 so I was directed to an animal hospital. First they did an xray and said he could have mild asthma, then the blood work came back. Liver enzymes so high they couldn't register. He was an indoor cat so I know he didn't get into anyth[Show More]I had to have my cat put to sleep last week. I'm still a mess over it. His breathing was extremely labored and he lost weight, took him to the vet his temp was only 97 so I was directed to an animal hospital. First they did an xray and said he could have mild asthma, then the blood work came back. Liver enzymes so high they couldn't register. He was an indoor cat so I know he didn't get into anything. The only link is the collar. He was a neat freak and groomed himself constantly. If anyone else has had this problem please post it. I really want to know if this collar killed my six year old baby (yes,I loved him like he was a family member. Almost as much as I love my children).

  • MikeJuly 29, 2022 at 8:11 pm

    The first of this year I bought two Seresto flea collars and put one of them on my older dog, a Pomeranian Terrier Mix, @ 14 years old. Within three weeks the seizures began, at first I thought she was going after a mouse..then I realize she's Frantically struggling to get her balance..to stand. I held her comforting her and it passed within 5 minutes. Within 3 days it happened again..I rushed [Show More]The first of this year I bought two Seresto flea collars and put one of them on my older dog, a Pomeranian Terrier Mix, @ 14 years old. Within three weeks the seizures began, at first I thought she was going after a mouse..then I realize she's Frantically struggling to get her balance..to stand. I held her comforting her and it passed within 5 minutes. Within 3 days it happened again..I rushed her to a vet where blood ,urine & exam, were done. They suggested her teeth be cleaned & a lower protein food . Then later that week another seizure..more tests. The two Vet trips cost over $1500. Then I read about the Soresto flea collars, I removed it and the seizures stopped..Ginger is back to her Happy healthy self. I'm retired & out the 1500.

  • BenJuly 24, 2022 at 6:30 pm

    Bought Seresto Flea collar at Walmart. We put collar on our 15 month old Kitty. Two and half weeks later Kitty started vomiting Several hours after eating. We removed collar 3 days ago. Found scabbed sores around Kitty's neck.. Kitty vomited today 5 hours after eating. Don't buy Seresto collar. There are far too many adverse side effects, and literally thousands of reports on the harmful s[Show More]Bought Seresto Flea collar at Walmart. We put collar on our 15 month old Kitty. Two and half weeks later Kitty started vomiting Several hours after eating. We removed collar 3 days ago. Found scabbed sores around Kitty's neck.. Kitty vomited today 5 hours after eating. Don't buy Seresto collar. There are far too many adverse side effects, and literally thousands of reports on the harmful side effects from this product. I wish I had done more and better research prior to purchasing Seresto collar and causing my cat such discomfort and misery.

  • IreneJuly 9, 2022 at 10:19 pm

    I bought a Seresto collar for my dog. She was fine for the first 8 months so I purchased a second collar for the next 8 month period but after wearing the 2nd collar for about 4 weeks her back legs started to buckle beneath her. Her breathing is often labored and she is quite thin. I’m praying that she bounces back. I’ve been trying to cleanse her insides with Pure Calcium Bentonite Clay and push[Show More]I bought a Seresto collar for my dog. She was fine for the first 8 months so I purchased a second collar for the next 8 month period but after wearing the 2nd collar for about 4 weeks her back legs started to buckle beneath her. Her breathing is often labored and she is quite thin. I’m praying that she bounces back. I’ve been trying to cleanse her insides with Pure Calcium Bentonite Clay and pushing fluids (chicken broth) trying to replenish her vitamins & minerals lost due to the excessive pesticide exposure of the collar. 🥲

  • SuzyJune 26, 2022 at 9:53 am

    This collar KILLED MY CAT!!! I placed it on her and within 24 hours she suffered a VIOLENT death!!! She was poisoned !!!

  • JustinJune 24, 2022 at 7:19 pm

    My 7 year old Jack Russel was diagnosed with Lymphoma today. We just purchased the serestro collar for the second year in a row a few months ago. Very sad he is so young.

  • KristeJune 20, 2022 at 4:47 pm

    My 11 year old German Sheppard started acting funny on day 3 of his new seresto collar and his back legs went out and was in severe pain and we had to put him to sleep.

  • LindaJune 18, 2022 at 5:27 pm

    I purchased two collars for each of my dogs. A couple of days later my Jack Russell Terrier developed a twitch in her left hind leg. This had never occurred prior to wearing the Seresto collar. I attributed the problem to her aging since my other mixed breed showed no visible sign of concern and was fitted with the same brand collar. The onset of my respiratory problem started about a week after [Show More]I purchased two collars for each of my dogs. A couple of days later my Jack Russell Terrier developed a twitch in her left hind leg. This had never occurred prior to wearing the Seresto collar. I attributed the problem to her aging since my other mixed breed showed no visible sign of concern and was fitted with the same brand collar. The onset of my respiratory problem started about a week after I began using this product on my pets. Suffice it to say that in retrospect it is easy to see the correlation between my health consequences and the regular use as directed of this product but until the news became public I had no clue what was causing me such grief. Thank you to whom ever brought this situation to light.

  • sandyJune 18, 2022 at 1:07 am

    cats got sick

  • GeorgeJune 16, 2022 at 10:44 pm

    I put one of those Sorrento tick and flea collars on my dog, and 9 months later I had to put him down. He got lymphoma because of that collar. I'm so heartbroken about this. I don't know what to do

  • AngelaJune 15, 2022 at 2:08 pm

    Our dog has been struggling with an appetite, diarrhea and muscle tremors that now we can relate to when she started wearing the collar. I can’t find anywhere that says how long it take to reverse the symptoms if you can at all

  • marilynJune 14, 2022 at 7:18 am

    My previously healthy 3 1/2 year old boxer developed severe cardiac issues and had to be put down after wearing a seresto collar for 6 months

  • JuliaJune 6, 2022 at 2:18 pm

    I put Seresto on my schipperkey. It was highly recommended for her by the vet bc she has a seizure disorder and pills were "more likely to cause seizures". I put it on her on Thursday. Today, 4 days later, one of her pupils is dilated and won't go back to normal. I just took off the stupid collar and made an appt to have her checked. I'm so pissed!

  • KirkApril 22, 2022 at 10:00 pm

    My dogs are my babys, I've bought seresto collars for them and I'm still finding fleas and ticks on them

  • SteveApril 19, 2022 at 3:48 pm

    Medium size terrier-lab mix used the Seresto collar for several years since 3-years old. Had seizures right away - thought that was an inherent problem with the dog who was a rescue at the age of 3 to our good home. So the dog had seizure medication since he was 3. Last year had hair loss on hind area. Thought it was allergies. Then I read the USA Today article. Removed and stopped using the[Show More]Medium size terrier-lab mix used the Seresto collar for several years since 3-years old. Had seizures right away - thought that was an inherent problem with the dog who was a rescue at the age of 3 to our good home. So the dog had seizure medication since he was 3. Last year had hair loss on hind area. Thought it was allergies. Then I read the USA Today article. Removed and stopped using the Seresto collar for the last 2 years. No seizures. Hair grew back. We just put the dog down yesterday due to inoperable throat and sinus cancer. He was 8 years old and otherwise very healthy before the cancer. The cancer was aggressive and quick - 3 months since diagnosis but could have started some time ago. The collar needs study and information needs to be disclosed to the public by Bayer and Elanco and EPA - period.

  • RobertMarch 27, 2022 at 7:00 pm

    I bought the Seresto Cat color for our cat because it would last throughout the whole summer rather than just a few months. My cat kept trying to pull it off, to the point of rubbing her skin raw. But it was effective and the next year I bought it again. I knew her health was declining but I never took her to the vet. I assumed arthritis was setting in. Her health continued to get worse through th[Show More]I bought the Seresto Cat color for our cat because it would last throughout the whole summer rather than just a few months. My cat kept trying to pull it off, to the point of rubbing her skin raw. But it was effective and the next year I bought it again. I knew her health was declining but I never took her to the vet. I assumed arthritis was setting in. Her health continued to get worse through the winter and I decided to get her checked out. My Vet did a lot of tests on her and said the only thing he found wrong with her was her thyroid. We put her on pills, but she stopped eating and got to where she could barely get up and walk. We had to put her down only 10 days later. I firmly believe this was all a result of this collar. I believe it adversely affected her thyroid over the two summers she wore it. People, watch for the signs. I refused to believe it was the collar. And now our pet is gone.

  • LisaMarch 22, 2022 at 10:59 am

    My 3 year old cat was in perfect condition with a thick soft luxurious coat. Put one of these collars on him and within months his failure on his neck is almost all gone and he has sores. I didn’t notice it because he lives in and outdoors. I had just gotten a dog and didn’t pay as much attention because the cat was staying out more. I took the collar off three or four weeks ago but last night [Show More]My 3 year old cat was in perfect condition with a thick soft luxurious coat. Put one of these collars on him and within months his failure on his neck is almost all gone and he has sores. I didn’t notice it because he lives in and outdoors. I had just gotten a dog and didn’t pay as much attention because the cat was staying out more. I took the collar off three or four weeks ago but last night noticed the sores are not healed yet. Horrid. My other cat is totally fine. I bought these both from Chewy in October 2021. Noticed problem in February 2022.

  • fionaMarch 21, 2022 at 2:27 am

    Bought a Seresto collar for my dog, within a month she had to be euthanased as she was so ill, despite having a clean bill of health from her vet just 2 months prior to putting on Collar. Bloods and scans were done and he could find nothing wrong with her, within the next 5 days her white cell count had dropped and her liver enzymes were high. My dog could not stand did not want to eat, was lethar[Show More]Bought a Seresto collar for my dog, within a month she had to be euthanased as she was so ill, despite having a clean bill of health from her vet just 2 months prior to putting on Collar. Bloods and scans were done and he could find nothing wrong with her, within the next 5 days her white cell count had dropped and her liver enzymes were high. My dog could not stand did not want to eat, was lethargic and as the days went on her health just declined more and more.

  • SheiliaMarch 11, 2022 at 1:26 pm

    I bought two collars from my vet and my dogs start choking and throwing up. Finally figured out it was the collars before it killed my babies.

  • C.March 9, 2022 at 8:55 am

    Our 22# mixed breed rescue dog developed thyroid cancer which spread to a nearby lymph node. They were removed successfully & she’s now doing chemo. We’ve had the Seresto collar on her for the two years we’ve had her. Is there a link & what’s the alternative?

  • SharonMarch 7, 2022 at 4:50 pm

    I bought the collar for my Golden Retriever a few years back. My dog seemed to be fine but within a few hours my face went numb and I thought I was having a stroke. After I was away from my dog the symptoms went away but as soon as I got near him, I felt like I was having a stroke again. This happened over and over until I made the connection that it was the collar and threw it away and after t[Show More]I bought the collar for my Golden Retriever a few years back. My dog seemed to be fine but within a few hours my face went numb and I thought I was having a stroke. After I was away from my dog the symptoms went away but as soon as I got near him, I felt like I was having a stroke again. This happened over and over until I made the connection that it was the collar and threw it away and after that I was fine.

  • TammyFebruary 26, 2022 at 6:57 am

    On Oct. 13, 2021, I bought 2 collars, at Walmart (which don't sell the fake collars) for my dogs, Benson a Weimaraner, and Mr. Jones, a chihuahua. Five days later, Mr. Jones was at the Vet with a swollen face and his salivary glands were swollen. A week later, he developed ulcers on both eyes. Over the next two and half months he saw two other Vets as well, for his eyes (we were at the Vet at leas[Show More]On Oct. 13, 2021, I bought 2 collars, at Walmart (which don't sell the fake collars) for my dogs, Benson a Weimaraner, and Mr. Jones, a chihuahua. Five days later, Mr. Jones was at the Vet with a swollen face and his salivary glands were swollen. A week later, he developed ulcers on both eyes. Over the next two and half months he saw two other Vets as well, for his eyes (we were at the Vet at least twice a month). The Iris leaked out of one, plugging the ulcer, and on Christmas Eve, the other eye ruptured. He had to have an enucleation surgery, removing both eyes. Benson developed a small lump in his throat approximately a couple weeks after wearing the collar. I had taken him to the Vet for stomach sickness, and she was concerned about the lump. The lump stayed small for about 2 months, but then rapidly enlarged. He was diagnosed with cancer, and I was informed, due to location and his age, there was nothing they could do (he was too old for anesthesia that was needed for a biopsy.). I have since changed his diet and started a holistic approach to keep him comfortable and retain some strength thru all this. He is most likely in the 4th stage of Lymphoma (there are 5 stages). Sadly, I never connected the collars with these health issues until it was too late. I have been reading the comments here and on regulations.gov, and it is so heartbreaking. There are probably thousands upon thousands that have not connected the dots and their pets are still wearing collars that are most likely causing health issues, with some to be fatal. If I could give any advice, I would recommend an all natural approach for ticks and fleas and for treating yards.

  • BarbaraFebruary 21, 2022 at 10:17 pm

    My 10 year old Boxer/Blue Heeler mix suddenly developed neurological issues - stumbling, seizures. He also developed an excess of platelets, causing white gums. After a day at the vet who tried to treat him, he returned home only to lose all neurological function that night. We had to put him down the next day. I had bought a Seresto collar for him two weeks before any of these symptoms devel[Show More]My 10 year old Boxer/Blue Heeler mix suddenly developed neurological issues - stumbling, seizures. He also developed an excess of platelets, causing white gums. After a day at the vet who tried to treat him, he returned home only to lose all neurological function that night. We had to put him down the next day. I had bought a Seresto collar for him two weeks before any of these symptoms developed. I had not heard of problems with the collar and my vet was also unaware. I feel so tremendously guilty that this product could have been the cause.

  • marieDecember 8, 2021 at 3:07 pm

    Our once healthy 8-year-old mixed labrador started to decline rapidly after using the Seresto collar with no warning. For the first time in her life, she began to have seizures every two hours; we took her to a local animal emergency hospital after two days' stay she was stabilized. She is on seizure medicine for the rest of her life every 8 hours. She is not able to walk without falling or sup[Show More]Our once healthy 8-year-old mixed labrador started to decline rapidly after using the Seresto collar with no warning. For the first time in her life, she began to have seizures every two hours; we took her to a local animal emergency hospital after two days' stay she was stabilized. She is on seizure medicine for the rest of her life every 8 hours. She is not able to walk without falling or support. I genuinely believe that the Seresto collar caused these neurological issues. ******************************************************************************************** google search - it's banned by the European Commission Bayer’s dog and cat “Seresto” anti-flea and tick collars contain a nicotine chemical (imidacloprid) that can cause seizures, thyroid gland damage, mutations, abortions and birth defects, (and is a class of widely used agricultural chemicals implicated in the catastrophic demise of honey bees, banned by the European Commission in 2013 for 2 years in Europe); and a pyrethrin chemical (flumethrin) that can cause nausea, vomiting and seizures among other harmful side effects.

  • DawnNovember 26, 2021 at 11:47 pm

    I have an American Bulldog who was seen by a vet Aug 5, 2021 for a through exam who was wearing a seresto collar. We returned to the vet Nov 2, 2021 and she now has cancer in her Jaw. Seems possibly related. Now she is terminal.

  • JeanNovember 23, 2021 at 9:48 pm

    We just lost our Jack Russell today. 11/24/21. We put a Seresto on Bella Boo on 11/11/21. She died. I will never use one of those again. Do we definatively know it was the collar? Not really.. but it was only after the collar went one that she went downhill.

  • LeithNovember 15, 2021 at 10:05 am

    My sister was visiting and bought my smallest rat terrier mix a seresto collar Friday night. There are two cats in our household as well. Saturday night after she petted the dog and then petted the cat, the cat went upstairs and died in his sleep. He was only ten and in perfect health. We are going to have his body autotopsized and have a toxicology screening to find out cause of death, but all I [Show More]My sister was visiting and bought my smallest rat terrier mix a seresto collar Friday night. There are two cats in our household as well. Saturday night after she petted the dog and then petted the cat, the cat went upstairs and died in his sleep. He was only ten and in perfect health. We are going to have his body autotopsized and have a toxicology screening to find out cause of death, but all I can think of that changed in our household was bringing the collar into it. When I came home Sunday I took the collar off of the dog and bathed him. I really hope he comes away unscathed since he only wore it two days. But based on what I have read some people have lost their pets within days of putting the collar on. If our beloved cat died due to toxins in this product I will use all my force to make sure it doesn’t happen to anyone else.

  • carlOctober 19, 2021 at 6:24 am

    Cat started having teeth and throat problems. Teeth had to be removed and he still has problems with throat. Has been using Saresto collar for about 2 years. Up untill using the collar he had no medical problems. I am wondering if the collar may be causing his problem. I have removed it and hope to see some change in him. Has anyone else had simular problem with the teeth?

  • LindaOctober 13, 2021 at 8:48 am

    I started using Soresto collar on my cat and dog the beginning of this year with no problems. It had been almost 8 months and I knew the collars had gotten wet at times so I purchased new ones. Ticks are horrible here in Pennsylvania. I put the new collar on Molly(cat) Wednesday morning Sept. 29,2021. My husband and I were going away for a week and our adult children check on the house and feed M[Show More]I started using Soresto collar on my cat and dog the beginning of this year with no problems. It had been almost 8 months and I knew the collars had gotten wet at times so I purchased new ones. Ticks are horrible here in Pennsylvania. I put the new collar on Molly(cat) Wednesday morning Sept. 29,2021. My husband and I were going away for a week and our adult children check on the house and feed Molly ( we take dog) like we have dozens of times. Friday Oct. 1, 2021 our daughter called me. She said Molly had vomited, and was laying on the floor drooling. I told her to remove the collar and let me know if that helped her. The next morning she told me she was walking around but hadn't eaten yet. Molly died Oct. 12, 2021. Now, she was 17 yr old. At least 4 times over the past 1-2 years I would find her laying somewhere not eating or drinking for 1-2 days. I would say my goodbyes thinking she wasn't going to make it thru the night only to have come strolling up to me as if nothing was wrong! I have been told by friends they're cat did the same thing. However, I think the collar was to much for her to recover from. Why had she not had a problem with the 1st collar. I thought nothing of putting the new one on her and just feel terrible about it. So much so that I will not put the new collar on our dog. I went back to Avantix. I don't care old she was. That collar had something to do with it, and I just want others to be aware. Molly had a good life and we loved her. May she rest in peace.

  • CathySeptember 16, 2021 at 9:36 am

    Healthy cat, put on flea collar, developed kidney disease rather quickly.

  • GloriaSeptember 13, 2021 at 2:18 pm

    On the recommendation of my vet I purchased a Seresto flea collar for my be!oved 10 year old dog Bella. After wearing the collar for a few days she suddenly started to lick the air with a slight foamy liquid coming from her mouth and shortly after this had a really bad seizure. I removed this collar and took her to the vets. When we got home she had another seizure and then another. The vet put he[Show More]On the recommendation of my vet I purchased a Seresto flea collar for my be!oved 10 year old dog Bella. After wearing the collar for a few days she suddenly started to lick the air with a slight foamy liquid coming from her mouth and shortly after this had a really bad seizure. I removed this collar and took her to the vets. When we got home she had another seizure and then another. The vet put her on seizure medication and carried out lots of tests. After three months watching her deteriorate and still having bad seizures I couldn't bear to watch her suffering any longer and had to say goodbye. My heart is broken, I believe the Seresto flea collar caused this.

  • SSeptember 1, 2021 at 7:23 pm

    Our dog suddenly started having seizures after use of this horrible Senestro product. The flea collar almost killed him and now he has to be on meds and isn't walking right. The EPA should ban this product. We should all be given compensation for the high vet bills and medication prescriptions. This is a terrible thing to do to pet owners!

  • JeniferAugust 14, 2021 at 6:04 am

    I had used Seresto Flea Collar on My Cat Repeatedly and He Developed Lung Cancer! His Tests Results where Study at Virginia Tech! I had No Choice , but to put Him to Sleep! He could’nt Breath! Oscar was the Best!

  • KateJuly 19, 2021 at 8:21 pm

    I just bought Seresto Large Dog collar from my vet for my Saint Bernard/Swiss Mountain dog. I am very concerned about using it as I have just heard of the many ill effects others have suffered from using them. Can I get my money back?

  • DawnJuly 3, 2021 at 12:45 am

    I bought this collar from Chewy.com. I've been using these for a few years. I never had a problem until this year. I don't know what they did different with them but within a few days of applying it to my dog she began walking funny and stumbling all over. She's a big Labrador well over 100lbs and never had any issues. She fell making several attempts trying to jump into my husband's truck. She wa[Show More]I bought this collar from Chewy.com. I've been using these for a few years. I never had a problem until this year. I don't know what they did different with them but within a few days of applying it to my dog she began walking funny and stumbling all over. She's a big Labrador well over 100lbs and never had any issues. She fell making several attempts trying to jump into my husband's truck. She was walking practically sideways through the house. We took it off her immediately. She has an appointment with the vet next week. I pray she has no side effects from this collar.

  • DonnaJune 20, 2021 at 7:14 pm

    Last year my cat Star developed a rash under her collar with scabs. The vet told me that I put it on incorrectly. After getting a new Seresto collar this year, she is now limping, lethargic, and eyes dilated. I took her to the vet and there was no explanation. My cat Twinkles has been diagnosed with kidney disease. Two years ago my cat Sammy had to be put down due to a cancerous throat tumor. I h[Show More]Last year my cat Star developed a rash under her collar with scabs. The vet told me that I put it on incorrectly. After getting a new Seresto collar this year, she is now limping, lethargic, and eyes dilated. I took her to the vet and there was no explanation. My cat Twinkles has been diagnosed with kidney disease. Two years ago my cat Sammy had to be put down due to a cancerous throat tumor. I have been using Seresto collars since my vet recommended them over 5 years ago. I have ordered them on line and noticed that some were made in Germany, South Africa, Kansas, and China. I had read to not use those from China.

  • RyanJune 15, 2021 at 1:31 pm

    It kills ticks because its a pesticide that is designed to absorb into your dogs bloodstream...and work its way out to the skin...the same skin your 6 year old touches when he pats the dog...ergo, if you wouldn't let your kid drink pesticide (because that would harm him), then why are you putting these products on your pets? Think people....for the love of god...think.

  • JamieJune 3, 2021 at 9:24 am

    Bought seresto collars for my 12 year old and 4 year old Rottweilers. 4 days after putting them on, my 4yr old suddenly started having seizures for the first time in his life. My older dog seemed lethargic and unsteady walking. Took both collars off immediately and was hoping all was well. 2 months later, my 4yr old started having seizures again and died on me. I'm convinced the collar killed him.[Show More]Bought seresto collars for my 12 year old and 4 year old Rottweilers. 4 days after putting them on, my 4yr old suddenly started having seizures for the first time in his life. My older dog seemed lethargic and unsteady walking. Took both collars off immediately and was hoping all was well. 2 months later, my 4yr old started having seizures again and died on me. I'm convinced the collar killed him. He was perfectly healthy and never had any seizures before I put the collar on him. I feel awful...thought I was doing the right thing protecting him from ticks, and ended up killing him instead.

  • NathanMay 31, 2021 at 1:26 am

    My dog had this collar on for 3 days, he started losing his fur around the area and has developed several lumps on his neck. Hes acting completely normal and doesnt seem bothered by the irritated skin and fur loss. DO NOT USE THIS PRODUCT!!!

  • CareyMay 24, 2021 at 1:54 am

    My dad bathed his 12 year old fur baby last Friday. Put on his new flea and tick collar. Sunday he went from normal to lethargic within moments...then died in his arms. 7 days prior he had a clean bill of health. I happened to come across this article about Seresto collars. Now I think I know what happened to our Bubba. And I am pissed!!! That was my dad's best friend.

  • AndrewMay 19, 2021 at 2:22 pm

    This product was being advertised on tv here in the uk and i thought "sounds ok I'll look into it".Looked on Google and came across this article,so the question is "should i avoid this product?

  • JaneMay 14, 2021 at 5:34 pm

    Myealthy untilonths after i put the Seresto flea and collar on her. She had a terrible episode 3 days ago and now she can't walk.

  • StevenMay 9, 2021 at 1:50 pm

    My pet fog had a rash or where he dug at collar .it cost 250 to treat him .plus maybe thats why ive ber. Itching.

  • RonMay 1, 2021 at 4:54 pm

    I believe Seresto caused the deaths of both of my Italian Greyhounds. I bought the collars in March, 2020. My 5 year old was diagnosed with a Spleen tumor in July 2020 and died in September. The vet told me the tumor was extremely rare in that breed, especially a dog that young. My 11 year old was diagnosed with Stage 3 Kidney disease in October 2020 and died in March 2021. Both dogs were healthy [Show More]I believe Seresto caused the deaths of both of my Italian Greyhounds. I bought the collars in March, 2020. My 5 year old was diagnosed with a Spleen tumor in July 2020 and died in September. The vet told me the tumor was extremely rare in that breed, especially a dog that young. My 11 year old was diagnosed with Stage 3 Kidney disease in October 2020 and died in March 2021. Both dogs were healthy otherwise with consistent vet visits and a healthy diet. I still have the containers the collars came in, and the last photos I have of both dogs show them wearing the collars.

  • BettyApril 29, 2021 at 3:33 pm

    We have been using this collar for years. When this notice came out we removed the collar and Harley was no longer lethargic. Now my sweet boy has hard lumps under his skin that are popping up all over him. I don't know if it related... yet

  • TaylorApril 26, 2021 at 9:41 pm

    I believe seresto flea collar is causing CKD in my cat. I had blood test to prove it. When on she failed her test months later off collar A'ced her test then on collar again failed BUN. I believe there is a connection between her kidneys and the collar. Bayer is evil, they don't pay enough money to do thorough testing important tests. they look at a couple results and go okay, money will do the r[Show More]I believe seresto flea collar is causing CKD in my cat. I had blood test to prove it. When on she failed her test months later off collar A'ced her test then on collar again failed BUN. I believe there is a connection between her kidneys and the collar. Bayer is evil, they don't pay enough money to do thorough testing important tests. they look at a couple results and go okay, money will do the rest.

  • AmandaApril 21, 2021 at 1:45 pm

    I have a 14 year old dachshund that has worn the Seresto collar for the last few years, no issues. I purchased this year’s from Chewy, as I have in the past. Put it on him just after Easter. He began being disoriented and losing movement on his back legs. Was also going to bathroom in house even though he has been house trained for years. Took him to vet. Said seizures and put him on meds. Did n[Show More]I have a 14 year old dachshund that has worn the Seresto collar for the last few years, no issues. I purchased this year’s from Chewy, as I have in the past. Put it on him just after Easter. He began being disoriented and losing movement on his back legs. Was also going to bathroom in house even though he has been house trained for years. Took him to vet. Said seizures and put him on meds. Did nothing. Stayed at vet for 2 nights. While at vet, I read of the Seresto issues and called vet to remove collar. We are on day 6 of no collar and still having issues. Bathed him in Dawn dish liquid to remove pesticides 3 times so far. Vet still hasn’t stated it isn’t collar-says that usually presents with skin irritation. Vet is saying it could be stroke or brain tumor. Praying that it’s just the collar and he will start to go back to normal soon.

  • LindaApril 17, 2021 at 10:16 am

    On April 8th I took my Main coon cat to the vets for her annual check up and shots. She in perfect health. April 9th put on a serento cat collar for ticks and fleas. April 15th while being patted she collapsed and died. Prior to her death after putting thr collar on she would.I thought she wanted to go out she had never done that in the ninteen years ive had her. She was trying to tell me she was [Show More]On April 8th I took my Main coon cat to the vets for her annual check up and shots. She in perfect health. April 9th put on a serento cat collar for ticks and fleas. April 15th while being patted she collapsed and died. Prior to her death after putting thr collar on she would.I thought she wanted to go out she had never done that in the ninteen years ive had her. She was trying to tell me she was sick. Bayer needs to be held responsible for people that have lost their pets. I am sick to think i lost her because of flea collar produced by them.

  • AnitaApril 11, 2021 at 2:53 am

    We have a beautiful loving almost 8 year old Golden Retriever which wore one of these collars . I just put a new one on her about a week or so ago. She was having trouble breathing specially laying down . Thought maybe allergies. Well it got worst . Took our previous Lady to the vets . When vet examined her asked about tick prevention n I said she has a new flea collar on. Then he said about her[Show More]We have a beautiful loving almost 8 year old Golden Retriever which wore one of these collars . I just put a new one on her about a week or so ago. She was having trouble breathing specially laying down . Thought maybe allergies. Well it got worst . Took our previous Lady to the vets . When vet examined her asked about tick prevention n I said she has a new flea collar on. Then he said about her lymph nodes on her neck, shoulders, back side n mamo glands are are swelled . It’s either an infection or cancer . Then he said with all the glands being swelled is likely to be cancer. Vet did byopsy n will let us know on Wednesday for sure. Vet gave her an injection of steroids n pills to take at home. Lady had a temperature of 101. My sister in law then sent us info on this collar n couldn’t believe that they would sell something like this to harm our precious fur baby . Needless to say I took off the collar n bathed her neck with Dawn soap. I’m praying for a miracle of Gods healing for our baby . Praying it isn’t cancer .

  • LizMarch 26, 2021 at 12:49 am

    My heart goes out to all those who have lost a beloved pet to this product. I lost my beloved Bo. Bo was 10 years old when I had to have him euthanized in May 2016. On a Thursday he had a grand mal seizure at about 6 pm. I rushed him to the vet and as we placed him on the table, the vet asked me how long he had the Seresto collar on. They got him stabilized and gave me anti-seizure meds since[Show More]My heart goes out to all those who have lost a beloved pet to this product. I lost my beloved Bo. Bo was 10 years old when I had to have him euthanized in May 2016. On a Thursday he had a grand mal seizure at about 6 pm. I rushed him to the vet and as we placed him on the table, the vet asked me how long he had the Seresto collar on. They got him stabilized and gave me anti-seizure meds since there was no one at the clinic overnight. Needless to say, I ripped that thing off his neck. Unfortunately, I had to have him euthanized by Saturday. I have copies of all his blood work-would like someone who knows to look at them to see if the cause of his death was from Seresto.

  • DawnMarch 23, 2021 at 3:38 pm

    I bought seresto colors for my 3 dogs last March 2020 I had left them on over the time frame that they recommended. Thought they are fine since I bought them the prior year with no issues.One of my dogs became very sick the vet wasn’t sure what it could be he was 10 years old. Did blood work and everything was looking ok but my dog had trouble walking was using the bathroom a lot.. Look like anoth[Show More]I bought seresto colors for my 3 dogs last March 2020 I had left them on over the time frame that they recommended. Thought they are fine since I bought them the prior year with no issues.One of my dogs became very sick the vet wasn’t sure what it could be he was 10 years old. Did blood work and everything was looking ok but my dog had trouble walking was using the bathroom a lot.. Look like another 10 years was added on to his life he was deteriorating in front of me all of a sudden with no answers as to why. He past away January 2021. My 12 year old dog started to seem like he was having the same symptoms starting as my other dog. Again wasn’t sure what it could be thought it was just his time too. One day I just took the color off was thinking could it be the collar ? He started to perk back up and now March 2021 he looks good for a 12 year old. I am not sure if it was the collar or not but hopefully other people that are having problems similar Maybe this will help in saving someone’s pet

  • RebeccaMarch 21, 2021 at 11:34 pm

    My beloved 4-yr.-old shih tzu mix had a healthy annual checkup and a month later she acted a little dizzy and lay down at my feet and suddenly died. I saw she had defecated and her tongue was hanging out and that she was dead. She had been wearing a Seresto collar.

  • StephanieMarch 21, 2021 at 1:26 am

    I’ve been using seresto on my Labrador for about 5-6 years. I had tried the frontline drops but his skin is very sensitive so it was recommended I use seresto. My dog was diagnosed with acute myeloid lukemia in the past 2 weeks. Which is a blood cancer from long term exposure to radiation or chemicals. Now I’m wondering if this is the cause. Since March 1st I’ve paid over 7,000 for hospitalization[Show More]I’ve been using seresto on my Labrador for about 5-6 years. I had tried the frontline drops but his skin is very sensitive so it was recommended I use seresto. My dog was diagnosed with acute myeloid lukemia in the past 2 weeks. Which is a blood cancer from long term exposure to radiation or chemicals. Now I’m wondering if this is the cause. Since March 1st I’ve paid over 7,000 for hospitalization, blood transfusions, injections, medicines and just started chemo so I know for what little time I have left with my sweet boy I will have thousands more in treatment. He also has lumps being monitored and they are on his neck where the collar would have been. Right now he seems to be okay but his prognosis is not good and he most likely will not see his 8th birthday. The emotional and mental exhaustion I’ve endured since March 1st is beyond what I could ever explain.

  • JoelMarch 20, 2021 at 7:15 am

    My Labrador got his Soresto collar in May, and in November was diagnosed with cancer. Put down day before Thanksgiving. All indications is that the Soresto collar caused the cancer.

  • ScottMarch 20, 2021 at 2:30 am

    I bought the seresto collar about a year and a half ago for my cat Bo. I found him 3 hours later under some brush by my door. His breathing was real weak and he was getting sick. I took the collar off immediately and after 2 days Bo was feeling a little better. It took a week before he seemed normal. I don't think he has any long-term effect from it, but I can't be sure. This stuff kills pets, I'm[Show More]I bought the seresto collar about a year and a half ago for my cat Bo. I found him 3 hours later under some brush by my door. His breathing was real weak and he was getting sick. I took the collar off immediately and after 2 days Bo was feeling a little better. It took a week before he seemed normal. I don't think he has any long-term effect from it, but I can't be sure. This stuff kills pets, I'm glad I was home and fixed the problem before something really bad happened. Shame on them and the EPA.

  • AnnaMarch 19, 2021 at 8:44 pm

    I also put this collar on my pup at 12 weeks. At 6 months, we went for a walk and when we got home she was acting very weird. I made sure she was watered and she curled up on my lap and went to sleep. Not 5 min later she work up twitching and acting strange. Her head was twitching, her eyes were twitching and she started whining. I picked her back up and held her. She looked super scared and[Show More]I also put this collar on my pup at 12 weeks. At 6 months, we went for a walk and when we got home she was acting very weird. I made sure she was watered and she curled up on my lap and went to sleep. Not 5 min later she work up twitching and acting strange. Her head was twitching, her eyes were twitching and she started whining. I picked her back up and held her. She looked super scared and then went into a full blown seizure. I had never seen that and had no idea what was happening. She was having them one on top of the other. I called my vet right away and she told me to take her to the vet hospital immediately. I raced her over there and they took her back and started medicine. After about 4 hours there, we tried to take her home but she started having seizure again. So, we left her overnight. Went back the next day and same thing, tried to take her home and she started seizing up again. The said the seizures she was having was gram mal seizures. I had them run every test they could think of to see what happened and came up with nothing. I spent over $2000 that weekend. The seizures have happened off and on over the last year and every time it is so bad. 2 weeks ago she had them so bad that she bit her tongue and would cry afterwards. She is on high doses of medication and just completely out of it. Now I hear these collars can cause seizure and death. My vet said there was nothing else we could do for my pup and I almost scheduled to have her put down due to the multiple seizures she has, but did not want to give up on her. Thank God I chose to not put her to sleep. I have taken the collar off, but have not stopped her medication. My pup is a Jack Russell/Chihuahua mix and neither parents have ever had seizures. I hope there is a lawsuit coming, because I have spent over $4000 trying to figure this all out and Vet visits and medication and bloodwork. So very sad...

  • MicheleMarch 19, 2021 at 5:44 pm

    I've used Seresto collars on all my animals for the past few years. Within a year my 13 year old dog Lola was diagnosed with lymphoma and had to be euthanized. I never made the potential connection until recently. In 2020 I had to have my six year old cat euthanized after a rapid decline in health. She had developed a gaping, bloody wound on her neck in the area where the collar was in contact wit[Show More]I've used Seresto collars on all my animals for the past few years. Within a year my 13 year old dog Lola was diagnosed with lymphoma and had to be euthanized. I never made the potential connection until recently. In 2020 I had to have my six year old cat euthanized after a rapid decline in health. She had developed a gaping, bloody wound on her neck in the area where the collar was in contact with her skin. She quickly lost massive amounts of weight and appeared to suffer from a neurological problems as she became very unsteady on her feet, unable to jump onto furniture or walk a straight line. I instantly thought the flea collar must have something to do with it and removed them from all my animals (4 total, 2 cats and 2 dogs). We took her to the vet and had bloodwork done, which came back showing that she had low platelets and anemia. We started treating her for that with antibiotics and steroids but within weeks her left eye bulged out of its socket. We rushed her to the vet where they examined her and discovered a large mass in her stomach. We decide that the humane thing to do was to say goodbye and have her put to sleep that same day. This all happened so fast. Prior to that she was a healthy kitty.

  • MicheleMarch 19, 2021 at 5:43 pm

    I've used Seresto collars on all my animals for the past few years. Within a year my 13 year old dog Lola was diagnosed with lymphoma and had to be euthanized. I never made the potential connection until recently. In 2020 I had to have my six year old cat euthanized after a rapid decline in health. She had developed a gaping, bloody wound on her neck in the area where the collar was in contact wit[Show More]I've used Seresto collars on all my animals for the past few years. Within a year my 13 year old dog Lola was diagnosed with lymphoma and had to be euthanized. I never made the potential connection until recently. In 2020 I had to have my six year old cat euthanized after a rapid decline in health. She had developed a gaping, bloody wound on her neck in the area where the collar was in contact with her skin. She quickly lost massive amounts of weight and appeared to suffer from a neurological problems as she became very unsteady on her feet, unable to jump onto furniture or walk a straight line. I instantly thought the flea collar must have something to do with it and removed them from all my animals (4 total, 2 cats and 2 dogs). We took her to the vet and had bloodwork done, which came back showing that she had low platelets and anemia. We started treating her for that with antibiotics and steroids but within weeks her left eye bulged out of its socket. We rushed her to the vet where they examined her and discovered a large mass in her stomach. We decide that the humane thing to do was to say goodbye and have her put to sleep that same day. This all happened so fast. Prior to that she was a healthy kitty.

  • JessicaMarch 19, 2021 at 4:59 pm

    I have used Soresto on my Golden mix since a puppy. At his 2 yr check up he was diagnosed with Lyme. Continued to use the collar and 6 mths later he had a Grand Mal seizure!!! He is alive, thank God but not the same dog. Im convinced it was caused by his Soresto collar!

  • NormanMarch 19, 2021 at 4:23 pm

    My dog developed a large pimple like growth on his head, near his right ear. Also, he has had persistent diarrea and extremely loose stools. I don't know if this is a result of switching from his previous flea control to a Serresto collar. But, I am suspicious.

  • allieMarch 19, 2021 at 3:07 pm

    My dog Mulligan who is 9 has been seizing like a humping motion in his hind legs after I put a serresto collar on him I figured it was just age - I heard this today on 1010 wins NY that these collars caused injury and death to several pets I just ripped these collars off both of my dogs immediately.

  • HeatherMarch 19, 2021 at 1:58 pm

    Crazy just saw this today. I started buying these a fee years back for both my dogs and cat. My golden started having really bad seizures multiple times a day and its been getting worse. Had no idea it was the collars. Him and I both have been dealing with ear issues; drainage and irritation. I've been having non stop drainage and went to my ENT several times with them saying nothing was wrong. Th[Show More]Crazy just saw this today. I started buying these a fee years back for both my dogs and cat. My golden started having really bad seizures multiple times a day and its been getting worse. Had no idea it was the collars. Him and I both have been dealing with ear issues; drainage and irritation. I've been having non stop drainage and went to my ENT several times with them saying nothing was wrong. They didn't see any infection. I've treated my dogs ears with no luck with him either. His seizures have gotten worse. I noticed my cat has been throwing up more as well. My other dog seems to be fine though and my husbanf has no issues. All of my pets sleep with us ...i removed the collars so I guess we will see if anything improves. I had no idea the collars were highly rated on Amazon.

  • MelissaMarch 19, 2021 at 12:08 am

    I had purchased his collar last summer thinking it would help as my dog gets many ticks. After about 24 hours of wearing the collar my dog was lifeless, He couldn’t walk. The only thing that has changed with me placing the collar on him the day before. I removed the collar and within two days he was back to his normal self.

  • MelissaMarch 19, 2021 at 12:06 am

    I put one one my goldendoodle when he was about 5 months. He was lethargic and falling over not long after putting in on. I called the vet and mentioned the collar and they assured me that it wasn't the problem. They couldn't get me in until the next day. He kept getting worse so I took it off and washed around his neck. He was getting better by the next day but not 100%. When we went to the vet t[Show More]I put one one my goldendoodle when he was about 5 months. He was lethargic and falling over not long after putting in on. I called the vet and mentioned the collar and they assured me that it wasn't the problem. They couldn't get me in until the next day. He kept getting worse so I took it off and washed around his neck. He was getting better by the next day but not 100%. When we went to the vet they gave him fluids for dehydration and again assured me it wasn't the collar. But wasn't sure what happened. He got significantly better after I took the collar off and it was definitely the collar!

  • PennyMarch 18, 2021 at 11:16 pm

    We just lost our 4-1/2 year old labradoodle from this collar. She had it on for 2 days, before she stopped eating and drinking. We took her to the vet, and ran all the blood test, and x-rays. Nothing at that time showed up. She went from a completely healthy dog to dying only 8 days later. The very next week this article came out and we discovered it was this collar. This DEFINATELY needs to be pu[Show More]We just lost our 4-1/2 year old labradoodle from this collar. She had it on for 2 days, before she stopped eating and drinking. We took her to the vet, and ran all the blood test, and x-rays. Nothing at that time showed up. She went from a completely healthy dog to dying only 8 days later. The very next week this article came out and we discovered it was this collar. This DEFINATELY needs to be pulled. I will never put another flea and tick collar on any dog. This terrible!

  • JRMarch 18, 2021 at 11:07 pm

    My cat had one of these for a couple weeks and broke out in a horrible rash. Her entire neck and shoulders were covered in lesions and scabs. Which became big gooey masses of blood and mucus when the scabs came off. She went from an extra affectionate cat to a cat that didn't even want you near her. She better now but it took months to get it healed.

  • JoyceMarch 17, 2021 at 11:44 pm

    My cat Bandit had Seresto collars for several years. Noticed when removing the flea collar, his collar area had no hair. It has remained completely bare for years even after stopping use of collar.

  • KimMarch 14, 2021 at 9:14 pm

    I started using the Seresto collar on my cat, shortly after he started throwing up a lot . I heard about the problems with the Soresto collars so I took the collar off and he was bald around his neck. Since I’ve taken it off he has gotten much better and doesn’t throw up anymore. Something needs to be done!

  • RoseMarch 13, 2021 at 10:42 pm

    My Border Collie Koko became mysteriously ill after I put a vet recommended Seresto collar on her. We spent thousands trying to find out what was wrong with her. She passed away after a few weeks of hospitalization and suffering. Our Akita became ill, following the same pattern and passed last week. Our third dog took the collar off and became ill but not fatally. These collars need to be removed [Show More]My Border Collie Koko became mysteriously ill after I put a vet recommended Seresto collar on her. We spent thousands trying to find out what was wrong with her. She passed away after a few weeks of hospitalization and suffering. Our Akita became ill, following the same pattern and passed last week. Our third dog took the collar off and became ill but not fatally. These collars need to be removed from market asap.

  • DeniseMarch 9, 2021 at 11:27 pm

    I have had my pets on serresto for about 4yrs, around that time my dog was looking in the air , paranoid with things he was never afraid of before , he also sleeps with me and I have developed Congestive Heart Failure 2 yrs ago and the Drs. Cannot tell me why it happened so quickly.

  • KimMarch 9, 2021 at 2:49 pm

    My dog has been wearing Serseto flea collar for 2 yrs.... a month ago as 2/8/21 starting having seizures out of nowhere, she is or was a health happy 9 yr old dog now we are having to put her down, her quality of life is no longer then...she won't get up to eat/drink or go outside. Did this collar have anything to do with it? I dont know but I find it weird she wore it for 2 yrs with no problems..[Show More]My dog has been wearing Serseto flea collar for 2 yrs.... a month ago as 2/8/21 starting having seizures out of nowhere, she is or was a health happy 9 yr old dog now we are having to put her down, her quality of life is no longer then...she won't get up to eat/drink or go outside. Did this collar have anything to do with it? I dont know but I find it weird she wore it for 2 yrs with no problems.... and we are faced with putting her to sleep because this collar with trust to keep fleas and trick of her may have caused more harm then good. Now my puppy who isn't a yr yet couldn't wear it because it broke her at in a rash around her neck... and once the collar was off, the rash healed.

  • SuzanneMarch 9, 2021 at 2:13 am

    My favorite dog ever Winston age 3 died after three months of a mystery illness. Now , I know exactly what happened to him .

  • AnnaMarch 8, 2021 at 9:17 pm

    My dogs have been wearing Seresto collar and when talking to my son why my dog was skittish and couldn't stand up straight and falling over and head tilting back he mentioned this problem. It describes everything the dog is going through. I am taking him to the vet to see if there are any side affects or long term problems

  • KarenMarch 8, 2021 at 12:26 am

    Both of my dogs got sick within a year of wearing Seresto collars and died soon thereafter. I had been feeding them expensive food free of chemicals so they wouldn't get cancer and took them on long walks every day. When I researched the cancer they were diagnosed with, I read it was tied to flee collars. It sickens me that they killed my precious babies. I'm still grieving the loss of Charlie las[Show More]Both of my dogs got sick within a year of wearing Seresto collars and died soon thereafter. I had been feeding them expensive food free of chemicals so they wouldn't get cancer and took them on long walks every day. When I researched the cancer they were diagnosed with, I read it was tied to flee collars. It sickens me that they killed my precious babies. I'm still grieving the loss of Charlie last August and Muffin the prior year.

  • ShellyMarch 7, 2021 at 11:00 pm

    Brownie became very lethargic. The vet found stomach full of blood. She asked if he could have eaten any poison. No way. He was euthanasia. We are heart broken.

  • StephenMarch 7, 2021 at 10:30 pm

    After using soresto collar my dog vomited blood and now has a heart valve problem.

  • SheilaMarch 7, 2021 at 1:25 pm

    My 15 old Bichon had 1st ever seizure after1st usage of Seresto collar 10/20; also stopped eating & drinking. Vet. gave meds ,flotiflora blood work. He has been sick every few weeks with vomitting, diarrhea. Blood work was ok vet suggested brain tumor. I read Seresto info & took off collar immediately.

  • PamMarch 6, 2021 at 9:12 pm

    I bought each of my 3 (indoor) cats and my dog Seresto flea collars. One of my cats developed cancer and had to be euthanized. Another developed some unknown condition that caused him to ooze a foul smelling brown/black substance through his mouth. He eventually stopped eating anything offered, became weak then also had to be euthanized. The cats were euthanized within a year of each other, and w[Show More]I bought each of my 3 (indoor) cats and my dog Seresto flea collars. One of my cats developed cancer and had to be euthanized. Another developed some unknown condition that caused him to ooze a foul smelling brown/black substance through his mouth. He eventually stopped eating anything offered, became weak then also had to be euthanized. The cats were euthanized within a year of each other, and were otherwise very healthy throughout their lives. I should also mention the cats were in no way related and came from completely different backgrounds. The surviving cat and dog no longer wear the collars and, so far, have not shown any reactions.

  • KellieMarch 6, 2021 at 3:52 pm

    I purchased two of these collars in May 2020 for my Boxers. My 5 year old Boxer was having seizures and died of a brain tumor 5 August 2020. Please let me know of any other similar cases. I have proof of purchase for the collars through Chewy.

  • DavidMarch 6, 2021 at 4:10 am

    I've been using Seresto on my 6 year old golden retreiver/ maremma cross with no issues. I'll continue to use them as they keep my dog flea and tick free with no side effects.

  • SandraMarch 6, 2021 at 4:03 am

    My 8 year old. 8 pound dog has worn the collar since she was two months old, we have never had a problem

  • BryceMarch 6, 2021 at 3:14 am

    Flea and tick medications need to have some component such as a repellent or insecticide to work against fleas and ticks. They are not innocuous as they suck blood occasionally to the point of causing anemia, transmit blood borne pathogens which can make pets sick, and cause a lot of irritation, dermatitis, itching and discomfort for pets. The use of any product involves some risk, just as riding [Show More]Flea and tick medications need to have some component such as a repellent or insecticide to work against fleas and ticks. They are not innocuous as they suck blood occasionally to the point of causing anemia, transmit blood borne pathogens which can make pets sick, and cause a lot of irritation, dermatitis, itching and discomfort for pets. The use of any product involves some risk, just as riding in a car or stepping into a bathtub. As a veterinarian I caution my clients to observe for any sign of local irritation, behavior changes, etc when using parasite control products. We need to protect our pets and therefore use these products. I often see some TERRIBLE problems when people are not using effective flea and tick products. They can cause problems but the incidence is quite low. Just because a pet has a medical problem it may be related to one of these medications but most often is not. Many pets who have never been exposed to these products develop seizures, cancer, kidney failure and several other diseases. There are many causes of disease such as environmental, nutritional, infectious, and genetic factors. Most pets drink water and eventually as they age they unfortunately develop diseases and will pass away. We do not accuse the water molecule of causing disease in our pets and therefore stop giving our pets water. The development of disease in water drinking pets is a coincidence as are most, but not all of the cases of illness in pets receiving parasite controlling insecticidal medications. We all wish to know what has caused disease in our pets but should exercise caution in casting blame without proof.

  • WyattMarch 6, 2021 at 3:00 am

    I glad something is finally happening to soresto flea collar.. my dog started having

  • VirginiaMarch 6, 2021 at 2:19 am

    Now that I look back. My westie had gone to the vets in April 2017. He had no issues. Bought a seresto colar and placed it on his neck. Less than a month passed and I noticed a lump at the top of his neck. He was diagnosed with lymphoma. He passed in June. We were dumb founded. To this day we believe it was the collar the killed my dog

  • MichaelMarch 5, 2021 at 2:39 pm

    I lost my dog to intestinal lymphoma last year. I never realized that the seresto collar he wore could have been the cause. We tried surgery twice before it was determined that he was too far gone and had to be euthanized. My female also wore the collars and now I want to have her tested to see if there are any signs of cancer. Bayer should be held responsible.

  • KrystalMarch 5, 2021 at 12:50 pm

    I was using these collars on all 5 of my pets. Two of which had a swift decline in health and were recommended by a vet to “go over the rainbow” and that is what we did. Could these collars have been the cause of their neurological issues and decline in health we now wonder? I thought we were protecting them.

  • HeatherMarch 5, 2021 at 4:40 am

    My Labrador Eddie has been suffering seizures for 2 years. Was told by vet this was the safest for dogs with seizures over trifexis. I had even did research and could find nothing at the time. SMH. He’s on high amounts of anti seizure medications and I am just hearing about this now. 2 years of Anxiety and not being able to leave him alone. Threw it away.

  • MasinaMarch 5, 2021 at 2:09 am

    We purchased this collar in July 2019 and our beloved Rocky passed away in Feb 2020... he was eating, nor was he moving.

  • LillyMarch 5, 2021 at 1:49 am

    I started using seresto flee collars on my little dog and know he is not eating well has no energy and I had blood work done and his has kidney issues.

  • EmmyMarch 5, 2021 at 1:18 am

    This is heartbreaking. My 15 year old wore the Seresto collar for about 36 hours after the vets on Martha’s Vineyard recommended it, due to the tick density there. We tore it off after a day and a half of Sire vomiting and pooping blood. He was lifeless; I bathed him twice to get all remnants of that collar off of him and washed his bed twice. I went to 3 different vets, hooked him up to an IV for[Show More]This is heartbreaking. My 15 year old wore the Seresto collar for about 36 hours after the vets on Martha’s Vineyard recommended it, due to the tick density there. We tore it off after a day and a half of Sire vomiting and pooping blood. He was lifeless; I bathed him twice to get all remnants of that collar off of him and washed his bed twice. I went to 3 different vets, hooked him up to an IV for fluids. They all denounced that it could have been the collar. I trusted my gut and took him off all the meds they prescribed to alleviate his symptoms. It took 5-7 days of home cooked puréed food, coconut water and bone broth. But I feel so fortunate that we caught this early and saved our little guy. I filed a claim with Bayer who also turned a blind eye. Bayer is evil for selling this pesticide laden thing!!! My heart goes out to everyone who lost their sweet doggie.

  • BlancaMarch 4, 2021 at 11:34 pm

    My female dog 3 years old wore the collar for about 4 month...she suddenly got sick..she had a kidney infections...lost a lot of weight..still not well at all.

  • reginaMarch 4, 2021 at 9:56 pm

    Mom bought Seresto flea collar for her cat Bella. Purchased fall 2020. Cat has health issues, since wearing this collar...Never knew about dangers to animals, until I read this article 3/42021 Purchased at Tractors Supply. Cut that collar off immediately. My Elderly Mother sleeps with her cat every night. 1/25/2021 my Mom had massive stroke. Wondering if this collars toxic chemicals had anything t[Show More]Mom bought Seresto flea collar for her cat Bella. Purchased fall 2020. Cat has health issues, since wearing this collar...Never knew about dangers to animals, until I read this article 3/42021 Purchased at Tractors Supply. Cut that collar off immediately. My Elderly Mother sleeps with her cat every night. 1/25/2021 my Mom had massive stroke. Wondering if this collars toxic chemicals had anything to do with her stroke?

  • STEVENMarch 4, 2021 at 4:39 pm

    this collar killed my cat, while using it, her skin wold become stuck to the collar like as if it was melting her hair and skin, we would remove it and it cleared up, we tried once more to make sure it was the Seresto flee collar and same result, we stopped using it fairly soon.Very soon after she started to choke and gasp on occasion, like asthma, but she didn't have any issues since i got her a[Show More]this collar killed my cat, while using it, her skin wold become stuck to the collar like as if it was melting her hair and skin, we would remove it and it cleared up, we tried once more to make sure it was the Seresto flee collar and same result, we stopped using it fairly soon.Very soon after she started to choke and gasp on occasion, like asthma, but she didn't have any issues since i got her about 4 years before? eventually, maybe within a year she got breathing issues and died with in 2 months. I believe it gave her cancer. The doctor said probably cancer. I had ask if it was covid and he said no. DON T NOT BUY THIS ITEM. Im hoping for a class action suit on this terrible product from lying companies.This cat (named Ms Kitty ) was my best friend ever, and this saddens me terribly to this day.

  • RobertMarch 4, 2021 at 6:17 am

    My dog chipper wore a seresto pet collar for years. and past away.I had no ideal they had pesticides in the collar.I really miss my chip!

  • DeborahMarch 4, 2021 at 1:44 am

    I gave my 8 yr old German Shepherd a new Seresto flea/tick collar 12/12/20. He stopped eating well but I didn’t realize it was from collar. He lost 30 lbs and the vet said the symptoms he started displaying was from a stroke. I had him euthanized by vet when he totally stopped eating and had no kidney function. This was 01/18/21.

  • dennineMarch 4, 2021 at 1:06 am

    I rescued my dog on 06/30/20. I visited a vet on 07/15/20 who sold me and put on my dog's neck a Seresto flea collar. Soon after my dog had a seizure, flailing around like a flounder on the floor. I called the vet she said it was probably due to the moon cycles. he had another seizure several weeks later and then the next day, he passed out, then came-to, defecated himself and I immediately brou[Show More]I rescued my dog on 06/30/20. I visited a vet on 07/15/20 who sold me and put on my dog's neck a Seresto flea collar. Soon after my dog had a seizure, flailing around like a flounder on the floor. I called the vet she said it was probably due to the moon cycles. he had another seizure several weeks later and then the next day, he passed out, then came-to, defecated himself and I immediately brought him to the emergency room. the collar was removed on 9/30/20 at the emergency room.

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