Seresto: Flea and Tick Control Made Easy

The Seresto collar kills fleas and ticks and is for use on dogs and cats

As a concerned pet parent, you know that protecting your four-legged friend from parasites like fleas and ticks is important. Topical pest control products can be messy and smelly, and with our ever-busy lives, it can be difficult to remember to apply every month. Have you ever wondered if there is anything new in flea and tick protection for your pet? Now available at PetMeds, the Seresto collar is the first new treatment in over a decade to offer flea and tick protection for both dogs and cats, and is also the first product to provide tick control for cats as well as for dogs. Best of all, it provides long-lasting coverage.

What does Seresto do?

The Seresto flea and tick collar provides effective control of fleas, flea eggs, flea larvae and ticks. The collar not only kills fleas and ticks, but repels ticks before they can bite, protecting your dog or cat from tick-borne diseases.

How long does Seresto last?

The Seresto collar lasts for 8 months

A Seresto collar begins working as soon as the collar is applied and will protect your dog or cat from fleas and ticks for up to eight months.  This innovative collar provides freedom from the inconvenience of applying a topical product to your pet every month, or trying to get your pet to take a monthly flea-control pill. It’s as simple as selecting the correct size collar and placing it around your pet’s neck.

How does Seresto work?

A unique polymer matrix allows the collar to slowly release controlled doses of the active ingredients, imidacloprid and flumethrin, over an extended period of time. Research has proven that the two active ingredients work synergistically together to dramatically increase their efficacy.

When placed on your pet, the ingredients in the Seresto collar are distributed on the outer surface of your pet’s skin and hair coat, where the ingredients come in contact with the parasites. The sustained release technology allows the migration of the active ingredients to adjust, depending upon the concentration of the ingredients within the lipid layer of your pet’s skin, thereby ensuring a steady, low-dose release.

What else should I know about Seresto?

The Seresto collar has a safety release mechanism

This innovative non-prescription collar is offered by Bayer Animal Health, and may be used on dogs 7 weeks or older, and cats 10 weeks of age or older.  It’s available for small dogs up to 18 pounds, large dogs 18 pounds and over, and cats of all weights. The collar is odor free, water-resistant and will continue to work even if it becomes wet or dirty, and the safety release mechanism prevents strangulation should the collar become caught or tangled.

Related Posts


  1. After my ex realized he was allergic to our 7 year old 100 lb.GSD, so I brought him home with me. His skin was dry and he was scratching a lot. I took him to the vet Tuesday night. He gave him an antihistamine injection, three meds and put a Seresto collar on him. I asked if it was safe since I have a Shipoo as well. They assured me it was.
    I spoke with the vet Thursday to let him know the scratching had subsided, but he was vommitting after eating and drinking. I was told that maybe the Cefpodoxime was upsetting his stomach, so I told them I would stop giving it to him. No mention was made of the collar. My ex told me he gets sick if he eats and drinks too fast. I split his meals and gave him only sips of water. He vomitted four more times in two days. Today, Saturday, he was sick again after drinking only water at the park. Tonight, after getting sick twice, I realized what was different was the Seresto collar. I took it off and washed his neck. Then I started reading this blog. I’m sitting on the floor praying I don’t need to wake someone up to help me get him to the emergency vet.

  2. I wish I read this sooner……. I used seresto collars on all four dogs, two Cane Corsos and two small dogs last year. The male Corso had two seizures in November. It is March 2016 and he had a seizure about a month ago with no collar on, then we put collars on again for this season 11 days ago. 7 days ago he had a seizure and two days ago he had two seizures. He has been lethargic for about a week. Very early this morning he was having trouble breathing, his back legs were giving out, he went blind, was disoriented, then became unresponsive and died less than three hours after waking up with breathing problems. The vet said he believes it was a brain tumor near the brain stem because everything happened so quickly. I am not so sure that was it after reading the posts here. And yes I am a real person who loves, and loved, his pets dearly. I don’t know if it was the collar, but they are coming off. It hurts too much to take the chance. The collar worked against ticks, but my dog was only six.What else is out there for ticks?

    • Hi John. We’re so sorry for your loss. You might ask your vet about some of the new chewables, such as Bravecto and Nexgard, that protect your dog against fleas and ticks .

  3. We were quite upset when our 5 year old Cockerpoo started to have seizures! WE never knew that Sorresto was linked to this condition and we have removed the collar and we are hoping the seizures end.

  4. Our indoor short-haired cat has been experiencing first facial focol seizures, and now grand mal seizures. My husband bought this flea color for both our dog and cat. Our dog is allowed off lease at the coast and gets fleas, which she brings into the house. Within a week of having the collar on him, the cat became larthargic. The following week he started yowling, within two weeks he was seizing. Because he is indoor, I wondered if the collar was the culprit. We’ve not added anything else new to the environment and hadn’t changed his food or litter. Within 24 hours he wasn’t yowling anymore, but the seizures started. We’ve been to two vets — one emergency and the regular vet. Blood tests are normal, so it is believed he was exposed to a toxin. Our regular vet has reported this. I’m sick to think we may have caused this. Our cat was an otherwise healthy, very active, playful part of our family. We are likely going to have to start him on anti-seizure medicine. I will never buy this product again.

  5. I have not used Seresto, but my dog began having seizures shortly after applying K9 Advantix II on her 2 years ago. She ended up having to go on phenobarbitol and we were finally able to wean her off after almost 2 years on the drug. We switched her to Nexgard, oral flea med and she has been fine. I would possibly consult your vet for meds if the seizures don’t subside and definitely use caution with topical flea meds.

  6. We were given Seresto flea collar from our vet for our 4 year old German shepherd. similar to other posts the dog became unwell and started having seizures. After learning there was some association with the collar (which our vet denied all knowledge of), we removed the collar and the seizures have stopped 7 months now, and he is back to himself.

    Worryingly we have a home abroad, and are now not certain if he has been sensitised and wont be able to have a rabies injection, in which case we have a huge dilemma. I would never recommend this to anyone.

  7. We put Seresto collars on my 9 year old bichon/yorkie mix and 14 week old english setter/pitbuill mix last night. This morning my husband saw the puppy have diarrhea and she is breathing fast. He took off the collar and he said she seemed better a few minutes later. He’s calling the vet now. We’re not sure if it was from wearing her collar for 12 hours or from wrestling with our older dog, she is still very mouthy and bites the neck area so may have had oral exposure to his collar. I had my husband take the collars off both dogs. Hoping she recovers fully and does not experience the issues others have reported here.

  8. Hello my vet referred me to seresto collars for my border collies one is a year old and the other one is just 10 weeks old. We live in a wooded area and always end up with a flea festation every year and I’m looking for the best solution and after reading about seresto collars I’m not too sure I wanna pay $45 to have an unwell pet or possibly fatality. Can someone give me some effective products to use other the this collar?

  9. I saw the advertisement of Bayer Seresto on TV and thought they were perfect for our Jack Russell Terriers. About 2 weeks later our 10 year old healthy JRT started having Seizures. He was put on IV Valium then Keppra. I asked my Vet if it could be the Seresto, she said no. Our JRT was doing fine on the Keppra, then started having Cluster Seizures. He was put on Potassium Bromide along with the Keppra. After reading all these horror stories I feel like a complete idiot. My poor baby had to of been sick because of the Seresto. I feel so terrible, I shouldn’t of believed our Vet. I’m in human medicine and trusted her. I’m going back to the cheap Hartz flea drops, my Jacks never had a reaction to them…I just thought Seresto was a lot cleaner and easier to use, oh how I was wrong.

    • Hartz drops are just as bad if not worse. They have a terrible reputation! It’s best to go with an oral flea medication like nexgard or bravecto

      • I don’t know why people are suggesting the chewable flea meds. I haven’t tried them all, but I put my papillon on a monthly chewable, and he started constantly hiding under the table for the first 2 weeks after each time I gave it to him. after the second month I figured it out.

  10. I have used Seresto collars for a few years on 2dogs. Never had problems. I now have them on my cats and they are doing great. I think as with any medication some will fail

  11. ALL flea and tick meds can cause a reaction and seizures. You are putting a toxin in or on your pet. Would you take it? I have seen hartz drops eat through a dogs neck (not a burn). My cat has had foaming at the mouth and confusion after applying frontline and advantage topical. My other 2 cats have never had any problems with topical or collars. You can’t put a hazardous chemical on your pet and think they will react the same. Same as allergies to foods, meds, and environment with humans.

  12. My Lhasa Apsara was on the chewable flea and tick preventive medicine. He had seizures from it. The last one he had was before Christmas last year. It was the worst one he had., He is wearing a Seresto collar now. I hope
    and pray it works for him.

Leave a Comment