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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 1243 reviewers.
Rated 5 out of 5 by Fantastic collar This was the first product I bought from this website. But the second time I've had the Seresto collar. I use it on my 58 pound plott hound/pitbull mix and the first time we bought it, it worked fanstic. However when the the first one wore off after 8 month, due to the price of it in the pet stores, we went with a cheaper product. She wore it for a month and was completely miserable, because the cheapy did NOTHING for the fleas, and I was bathing her more than once a week(she's a short hair, so I shouldn't have to bathe her so often). So I was thrilled to find it on chewy.com for half the price of what pet stores sell it for. We got it yesterday, and she's had it on for 24 hours and I've already seen a tremendous change already. She is so much happier, will definitely keep buying from here. Thank you Seresto and your fantastic product, and chewy.com for your great service and fast shipping. January 15, 2017
Rated 5 out of 5 by Finally something that works!!!!!! Moved to the country in the south 6 months ago. Since then my poor dog has been having a full fledged infestation! I would use frontline every 3 months before just for a precaution but after moving i would try one thing after another after another and it would be a full fledged infestation within 4 days. So at my wits end i searched this site once again for yet something else to try and happened across this gem. I was doubtful coz it's a collar. No collar i ever heard of worked. But thought why not let me try it at least. Put it on my 80 pound dog last night and by the morning I struggled to find a flea!! And when i did it wasn't even scurrying i could just pull it right off!!! I am so in love with this collar! Even if it only last 4 months i don't care. I'd rather replace something every 4 months than not being able to do anything after 4 days. Keep in mind. Dogs like humans react differently to products so it will work for some dogs and not for others i guess. It works for my little massive angel and I'm extremely happy. At least give it a try i say!! December 3, 2016
Rated 5 out of 5 by Bye Fleacias I was using a competitor topical flea treatment every month on all the animals in my house. I live in the suburbs and all my animals have flea treatment on (a cat and a dog). I take my dog for walks in various places and she runs in bushes. I was horrified to discover fleas on her. I applied additional topical (2x in one month) and I kept seeing more fleas. My dog does not wear a collar unless we are on walks and has an awkward shaped neck. I was reluctant to put a flea collar on her for looks, and how could something work for 8 months?! The fleas stressed me and I caved and bought a Seresto collar and have not seen any fleas since. I saw a few sick looking fleas a few days after applying it but then never again. I also did not have time to mega clean my house and everything I owned that was fabric. I washed my dog beds, blankets and my bedding but nothing like I read people do on internet forums (not a good idea to read when your dog has fleas) and the fleas were gone. I vacuumed a good cleaning as well, but again nothing crazy just a basic good cleaning every few days, a little bit more then I normally would. I also still sleep in bed with my dog, and pet my dog and have not noticed any "residue" or ill effects from this collar. January 15, 2017
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 5 out of 5 by Love this collar! Our 80lb yellow lab ran away from a doggie hotel this past summer. She was on the run for 12 days in the deep woods in the mountains. When we were searching for her, we had several ticks on us... but on the 12th day when we finally caught her, she still had her Soresto collar on and not ONE tick or flea on her. We were so blown away by the effectiveness of this collar. Our other dog suffered from a tick disease years ago which almost took his life. We had always used the topical medicine faithfully with him, but he still ended up with Rocky Mountain Spotted Fever and often had ticks on him. We started using this collar with him, we haven't seen one tick since. We always make sure our dogs are wearing the Soresto collar. They can swim, sleep with it on, and even has reflectors for walking at night. It has never fallen off either of our dogs. It's safe for you to touch and is odorless. Highly recommend! November 22, 2016
Rated 5 out of 5 by It works!!! Honestly, I had my doubts about the soresto flea collar. Even after reviews from people I know personally. I just thought, how much good can a collar really do when it's just around the neck and not in their skin!? However after buying one for my indoor/outdoor cat, I couldn't wait to buy one for my dog! Not only is it cheaper than the oral medicine I was giving him monthly, but it lasts a lot longer, too!! I will continue buying these collars from now on and ALWAYS from Chewy as they deliver super fast and have great prices!! January 10, 2017
Rated 5 out of 5 by This collar works very well Living where it is warm most of the year this collar worked well. I would recommend it, the only thing that makes it hard to purchase is the overall price, for someone like me on a fixed income that can be quite costly buying it on payments would have been awesome and buying it at a discount price during winter Months is even better. January 15, 2017
Rated 5 out of 5 by Must Have for ALL Dogs! My dog (who is now 10) is very sensitive from his skin to his digestive system. After many years and money spent trying to find the right product to permanently get rid of fleas and help his skin heal I found seresto. I was a little concerned trying it out because it sounded too good to be true, but Bayer is a trusted brand so I bought. Within the first two days my dog was able to get some good sleep and all his fleas were gone! He is a happy dog now! January 15, 2017
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