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Seresto 8 Month Flea & Tick Collar for Large Dogs & Puppies (over 18 pounds)

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With its innovative delivery system, the Seresto Flea & Tick Collar for Large Dogs & Puppies (over 18 pounds) offers a breakthrough in tick and flea control for dogs for 8 months. Inside the unique polymer matrix of the Seresto collar are two active ingredients: imidacloprid, which has been used in products recommended by veterinarians for years to control flea infestations, and flumethrin, which effectively repels and kills ticks, larvae and nymphs. These ingredients work together in this unique flea collar to provide dual action against fleas and ticks like no other treatment!

Key Benefits

  • Easy to use 27.5-inch adjustable collar that is perfect for dogs 7 weeks and older and over 18 pounds
  • Kills fleas and ticks to prevent transfer of organisms that cause disease
  • Provides continuous protections from fleas and ticks for up to 8 months
  • Non-greasy, odorless, water-resistant and easy to use
  • Comes with reflector clips to help keep your dog visible at night
  • Performance you would get from a topical treatment but in a convenient easy to use collar


The collar is designed with a safety-closure mechanism. In the unlikely event of a dog being trapped, the dog's own strength is sufficient to widen the collar to allow for quick release. ALWAYS read the entire product label prior to use.

See all items by Seresto

  • Item Number
  • Brand
  • Breed Size
    Small, Medium, Large, Giant
  • Lifestage
    Puppy, Adult


8-month prevention and treatment of ticks, fleas and lice on small dogs and puppies 7 week so f age and older and above 18 lbs. The collar should be worn continuously for the 8 month protection period. Check periodically and adjust fit if necessary, especially when puppies are rapidly growing. Keep the collar in the bag and in the outer packaging until use. Replace the collar after 8 months for optimal tick and flea protection.

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Customer Reviews

Rated 4.6 out of 5 by 1036 reviewers.
Rated 5 out of 5 by Seresto Collars WORK We live in Connecticut where ticks and Lyme disease are rampant. I'm not a fan of the flea drops because of the side effects, including the "skin crawling" sensation my lab would experience. For me, the Seresto flea collars are the reliable and safer choice. We've been using the Seresto Large Dog flea collar for almost two years with my 65lb lab and the ticks I have found have either been dead or just crawling on him, even after a day in the woods. Proof enough for me the flea collar is working if the ticks aren't biting him or die before they become engorged. Now that we've added a second rescue pup to our family, I'm back for another collar because I know it will keep both of my dogs safer. I don't have to worry about the side effects of the drops or them licking insecticide off each other or themselves. The collar is also a much more economical purchase than the drops. Chewy has a great price on this collar (as with everything) and their customer service is exceptional. July 26, 2016
Rated 4 out of 5 by Great product, recommend w expections I was really excited about the selling points and features of the Seresto collar.. Replace after 9 months, waterproof, not smelly like some flea/tick collars. All of which are true. This collar works to keep ticks and fleas from biting your pet. Seresto works when Frontline doesn't (not Frontline's fault as ticks/fleas have adapted) I really recommend this collar. In fact, when the 9 months were up, I get two...one for each dog. First dog was kind of a "guinea pig" experiment. But for some reason, guinea pig dog reacted badly to the new collar, while dog #2 didn't have a reaction. It will be interesting to see if dog #2 has any bad side effects the second time around. If she does have a reaction, I can no longer recommend this product. But only time will tell. For now, I say this product is really great. October 30, 2016
Rated 5 out of 5 by A great value I have 7 dogs in my home. I have been struggling for years with the effectiveness, cost and difficulty of applying topical flea/tick treatments. My dogs hated them! Pill treatments didn't work well either. I first purchased Seresto from a company in the UK (before finding chewy.com) to test it with 2 of my dogs. Within days their fleas were gone and their skin irritations started to clear up. It was like the miracle I had been looking for. We also had a problem with ticks, but not anymore. And by the way, mine actually did last the entire 8 months advertised. Because it really works for me, it's the most cost effective solution I've found to date (it costs about $5/month per collar from chewy.com). The collars contain the same dosage so I'm able to split one large collar into 2 smaller ones (the only differences are the large collar is wider and longer than the small). No more stressful applications of topicals for any of us. I hope I'll never have to use anything else. July 21, 2016
Rated 5 out of 5 by The collar has to be placed properly to be effective I have used the Sorresto collar for 3 years as the only flea product my Sheltie can tolerate. I'm a dog groomer that worked many years at a vet office where this collar was recommended regularly to customers with flea and tick problems. The main thing to remember when using this collar, is it has to be pretty tight on the pet to be effective. The active ingredients work through skin contact, not just being on the pet. I believe some people that have complaints may not be using it properly. There should only be one to two fingers space between the collar and dog. This collar has safety breakaway for this reason. Chewy.com has the best prices I've found! October 30, 2016
Rated 5 out of 5 by Seems to work well Product I bought for fleas says it lasts 8 months...the price proves it...they were approximately 40.00 per collar...They are working now, we will see how well they work closer to the 8 month mark. The collar comes with 3 attachable reflectors. They are great to see my dogs in the dark back yard at night! October 30, 2016
Rated 5 out of 5 by Effective and economical I started purchasing Seresto collars for my dogs on veterinary recommendation a couple of years ago. They are very effective for control of fleas and ticks. Having checked the price at a local pet supply store I ordered from Chewy where they are half the price! Delivery is always super fast as well! October 29, 2016
Rated 4 out of 5 by unsure... I have only had this collar for my dog for about 2 weeks so I cant review the longevity of it, but I can tell you this: My dig still has a flea problem. I can tell that they dont go past his feet and not very far into his belly area, but he comes in from outside and has them all over his paws... I am not sure if we are dealing with a super flea or my yard is just that infested, but its only 3/4 helped us. October 26, 2016
Rated 1 out of 5 by Dogs still have fleas I was assured that this product would work in killing the fleas on my dogs. I bought 4 flea collars for large dogs and put them on my four dogs. The dogs still have fleas after wearing the collars for over two weeks. Not happy....especially with how much these collars cost. October 30, 2016
  • 2016-10-31 T06:50:39.954-05:00
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