SERESTO Flea & Tick Collar for Dogs, over 18 lbs, 1 Collar (8-mos. supply) -

Seresto Flea & Tick Collar for Dogs, over 18 lbs

By Seresto
Rated 3.9905 out of 5 stars

Buy 1, Get 1 25% off- Mix & Match

$50.45Chewy Price
$67.98Chewy Price
$47.93Autoship Price
Autoship (Save an extra 5%)

Why Autoship?

  • Save 5% on all future Autoship orders
  • Set your schedule based on your pet's needs
  • No fees, no commitments - skip, change or cancel anytime.

In Stock
FREE 1-3 day shipping

About This Item


  • Veterinarian-recommended prevention treatment kills fleas and ticks on puppies and dogs 7 weeks and older weighing over 18 pounds.
  • Starts to repel and kill fleas within 24 hours of initial application and re-infesting fleas within two hours; works on contact with no painful biting required.
  • Also repels and kills ticks within 48 hours of initial application and re-infesting ticks within six hours; works on contact with no painful biting required.
  • Easy-to-use, 27.5-inch adjustable collar is odorless and non-greasy; quick-release feature and visibility reflectors provide extra safety.
  • Water-resistant formula continues working for up to eight months, even after bathing, swimming and sun exposure.

See More





Play Video: Learn More About Seresto From Our Team of Experts
Learn More About Seresto From Our Team of Experts

Important Information

Fleas rise to the top of your pet's coat as they die, so consider it a triumph if you start seeing more fleas at first, after treating your pet. If you’re still seeing fleas after application, it may be because your pet has picked up new fleas from the environment, which may include other pets, surfaces and outdoor areas. It may take up to 30 days to break the entire flea life cycle. Additionally, you should also treat sources of new fleas (i.e., carpet, yard, etc.) to ensure complete flea control.

Questions & Answers

55 Customer Questions

For dogs with longer hair, like a chow or Bernese Mountain Dog, does this need to touch skin or will it still work on top of thick/long hair?
Answer by GregMar 11, 2023
We have golden retrievers which have longer hair and the work fine for them. According to product information I have seen, the collar just needs to be in contact with the fur/hair.

How do you loosen a collar that has become to tight
Answer by ChewyDec 19, 2018
Seresto is designed with a safety release mechanism. A hard pull causes the ratchet-release mechanism to allow a widening of the collar.

Does this collar kill mites too?
Answer by ChewyAug 04, 2017
The active ingredients protect from fleas, ticks, and lice. Mites are in the same family as ticks and may be controlled by this collar, but this is not a specified function of the Seresto collar.

Is Seresto by prescription only?
Answer by ChewyFeb 20, 2018
A prescription is not required for this collar.

ReviewsWrite a Review

Rated 3.9905 out of 5 stars
7230 Reviews
Would recommend to a friend

7230 Customer Reviews

Filter by reviews that mention

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.
Rated 5 out of 5 stars
By 3ofusinNC on Mar 16, 2023


So I was a little skeptical about these collars before I purchased them. I had read some reviews online and they were very back and forth, but I decided to go for it anyway! I live in Southeastern North Carolina, and the fleas and ticks rear their heads a lot earlier in the year, so I thought I'd get a head start. The first few days of my dogs wearing the collars, I was tempted to just take them off because it seemed like it was making them itch MORE. I then realized they aren't used to wearing collars at all (we are a harness house for outdoor activities) so I gave it a few more days and I am so glad we stuck it out! The dogs have been wearing the collars for about 2 weeks, and the difference is dramatic. No fleas anywhere, and the dogs are so much more comfortable. Glad I already turned the autoship on so I don't even have to worry when its time to reorder!

Rated 4 out of 5 stars
By LadyRedRider on Mar 23, 2023

Good for some, really bad for others

This product does what it says it will do but if your dog is allergic then things can be really bad. 1 of 5 had a major reaction. The issues were resolved quickly after removal. There are some serious allergic/sensitivity reactions that must be observed. This product has been known to cause death and life-threatening reactions. We were aware and prepared. I would recommend this product only with customers who can and do monitor their animals the first 24 to 48 hours.

Rated 5 out of 5 stars
By AMWHITIE on Mar 22, 2023

Great Flea / tick collars

I have been using these since my two German Shepherds were puppies (now 6 years old). Simply put them on loose enough to whereas they will just lay and touch the fur **NEVER put these on tightly!!** So many people complain they have problems with rashes and these don't work for them, many cases I chuck this up to consumer error!! The collars naturally release over the 8 months simply by touching the animals fur. I feel as though they are a great product, give them a try!

Rated 4 out of 5 stars
By Elizabeth on Mar 3, 2023

Favorite Flea and Tick Option

This is my favorite flea and tick option for many reasons. My dogs do not reactive negatively to them in any way. I have never seen a flea on them and the only ticks I have seen were ones that had just crawled on them during a hike or were dead. I believe they do not prevent the ticks from biting them, but they kill them after they do. I wish that it did a better job at repelling them all together. We have been using these collars with out 2 dogs for 3 years now. I buy new ones when the weather starts to warm up and just keep them on through the winter. So 12 months, not 8 months (but they are at their strongest during peak seasons)

Rated 1 out of 5 stars
By Mlawson on Mar 23, 2023

Stay away from this brand

Within days of putting this on my dog (Moose, Great Dane) we noticed a red spot. Once we noticed this we took it off immediately and took pictures and cleaned him up. It was put on 2-3 fingers loose like instructions say. I will never put another seresto brand on my dogs again.

Rated 5 out of 5 stars
By Janna on Mar 7, 2023

BEST flea & tick prevention

This Seresto collar is the way to go. We live in an area where ticks are plentiful. And our dogs love to chase and catch rabbits. This is an amazing protection collar. We generally take it off of them when they swim to prolong the life of the collar. And ‘Chewy’ is an amazing company to offer auto ship. And if I have any problems or questions about my order, they are very prompt to reply and assist. I tell my friends that have pets to utilize Chewy. Love it!

Rated 1 out of 5 stars
By Vicki1 on Mar 13, 2023

Do not think it works as used be

I noticed it is not Bayer anymore, my previously was from Europe. I washed my dog with flea shampoo and put this new Elanco collar. After 4 days I still do not see result, my dogs still itching, and I see fleas still when I brush him with fleas comb. I know every one is different and maybe it is dog personal things, we will continue use it but I doubt it is same as used be.

Rated 4 out of 5 stars
By BusterMom on Feb 6, 2023

Seems safer than Nexgard

I switched one of my dogs to the collar after he had a horrible attack of pancreatitis after his 2nd dose (ever) of Nexguard -- we had switched after many years of using FrontlinePlus which was losing it's potency. Not 100% sure the Nexguard triggered the pancreatitis, but definitely a possibility given it came on one day later and was the only odd thing he ingested. Don't love the fact he must wear an extra collar nonstop, but it has no odor and seemed to do the trick (no sign of fleas or ticks). Only just learned it does NOT protect 8 months against ticks (only 4 months for those), so will need to swap it out more frequently then I thought. Oh, and also the glow in the dark clips don't work (plus I figured they might rub against his neck too much, but they never glowed in the dark anyway). It also stays put once I put it on him, never came off (unless I took it off) in 8 months. They shouldn't get away with the "8 month protection" blurb the front of the tin, however, given that only applies to fleas.

Rated 5 out of 5 stars
By Teresa on Mar 16, 2023

Love these collars

we have used these collars for several years now and love them. They keep all fleas off our dogs and kill all ticks that we find. We actually keep them on all year since we live in a mild climate. We change them every March to make sure to be strongest for tick season. They still keep fleas gone all 12 months.

Rated 5 out of 5 stars
By June on Mar 17, 2023

Easy, effective and price is right

I've been using these collars for a few years now. We hike in the woods and fields with our dogs every day and ticks are a real problem in southern Ohio. They come home each day without a tick or flea on them! It couldn't be any easier and no more liquid on me or them every month-I hated that!