Vet-recommended flea and tick collar
Seresto flea and tick collar for dogs and cats
Seresto is a flea and tick collar that keeps working for 8 continuous months. Its two active ingredients, imidacloprid and flumethrin, are stored in the collar and released slowly, so fleas and ticks are killed and repelled by contact — they do not have to bite your pet to die.
Starts within 24 hours · Lasts 8 months · No prescription
8 monthsof continuous protection from one collar
24 hoursuntil it starts working
1 collarnothing greasy, nothing to repeat monthly
No prescriptionsold without a vet visit
Which Seresto collar fits your pet?
Seresto comes in three sizes. Pick by animal and by weight.
Dogs over 18 lbs
Large breeds and growing puppies 7 weeks or older
from $49.99
Dogs under 18 lbs
Small breeds and puppies 7 weeks or older
from $59.92
Cats and kittens
Kittens 10 weeks or older
from $49.99
How does the Seresto collar work?
- 1
Stored in the collar
The active ingredients sit in the collar's polymer matrix and are released in small amounts over 8 months.
- 2
Spread across the coat
From the neck they spread over the skin and coat of the whole animal, nose to tail.
- 3
Kills and repels on contact
Fleas and ticks are killed and repelled by contact, so they do not need to bite first.
- 4
Working within 24 hours
Protection starts within a day of putting the collar on and continues for 8 continuous months.
At home, no vet visit
Putting it on takes a minute
- Take the collar out of its round tin and unroll it.
- Put it around your pet's neck and push the end through the buckle.
- Adjust the fit as the label in the box describes, then trim the extra length.
- Write the date on the calendar: replace the collar 8 months later.
Collar + Pet Protect sets
For one order for the season, each Seresto size also comes boxed with a Pet Protect supplement from the makers of Advantage — calming chews, hip and joint, skin health, allergy and immune, multivitamin, omega 3, probiotic gel and more.
What owners say about the Seresto collar
This really helped with the fleas!!
Now this worked! After trying natural plant based collars to get rid of fleas and larvae to no avail. I had to go to this. I am not a fan of medicated collars, but we had to use something a bit stronger. So after using Wondercide shampoo, I put these on my pups. They worked. I didn't notice anymore scratching, and both dogs seemed much happier. I din't notice any alarming side effects or lethargy. No scent was nice too
AGSeptember 28, 2026 · Large Dog Collar
It really works! Lasted 4 months!!
This really works. I ordered this in April for my 2 small dogs( Bischon Frise & Shitzu/yorkie mix). It is now September and I am just having to purchase a new one. They got their first flea literally last week. I can’t believe the collars lasted 4 months. My backyard is huge and surrounded with so many HUGE trees. Great price for the quality of protection. Do not hesitate to get this to keep your fur babies safe.
Bianca M.September 9, 2026 · Small Dog Collar
It works!
It works! I put a large Seresto collar on my German Shepherd and a small on my chihuahua. No fleas at all a few ticks here and there on my German Shepherd but nothing major she is an outside dogs and is friends with the stray cats so a few ticks is to be expected. No smell easy to use no side effects the collar stays on.
Angelica E.September 3, 2026 · Small Dog Collar
Buy if you hate fleas
I have used this product for over 6 years with no issues. It does what it says, keeps fleas and ticks away and extremely easy to put on. The price is a little high you may think, but seeing as this lasts 8 months, it’s worth the money. I had a serious flea issue in my neighborhood but after my dogs and cats got this, we had zero fleas inside our home. It gives off no scent and you forget they have it on at times because it doesn’t have the stick or greasy feel like other flea collars do.
Deb E.October 4, 2026 · Cat Collar
Bar none the best!
My cat was immune to ALL flea drops! From the most expensive down! He was miserable and still had fleas. As a last resort I ordered this collar even tho it was so expensive. Hallelujah! It worked! Took maybe 3 days but it worked! All his hair is growing back from him chewing on himself and all the (TMI) scabby areas are gone Yea, it’s spendy but supposed to work for 7-8 months so it is comparable to drops in price. I and Seamus (the cat) are forever in your debt. Thank you Seresto!
JamieSeptember 16, 2026 · Cat Collar
Seresto collar: what to know
Is Seresto vet-recommended?
Elanco Animal Health, the maker, describes Seresto as the #1 veterinarian-recommended flea and tick collar, based on its own data on file. The collar is sold without a prescription and is meant as long-lasting flea and tick prevention that owners can put on at home.
How long does a Seresto collar last?
One Seresto collar kills and repels fleas and ticks for 8 continuous months. Because the ingredients are released from the collar gradually, there are no monthly doses to remember: put the collar on at the start of the flea and tick season, mark the date, and replace it 8 months later. For two pets, or for a second season, the 2-collar packs cost less per collar.
Dog collar sizes: over or under 18 lbs
The large dog collar is for dogs over 18 lbs, the small dog collar for dogs under 18 lbs; both are for dogs and puppies 7 weeks or older. If a puppy will grow past 18 lbs during the 8 months, the large collar is the better choice. The cat collar is for cats and kittens 10 weeks or older.
Swimming, bathing and wear
The collar is odorless and non-greasy, and it is worn like a normal collar. Check the label that comes in the box for how swimming, bathing and shampooing affect the duration of protection, and for the full directions and safety information for your pet.
Seresto collar FAQ
How long does it take for the Seresto collar to work?
It starts working within 24 hours of being put on and keeps working for 8 continuous months.
Does the Seresto collar kill fleas and ticks?
Yes. It kills and repels fleas and ticks through contact, so they do not have to bite your pet to die.
Do I need a prescription?
No. Seresto is sold without a prescription.
Which size should I buy for my dog?
Over 18 lbs — the large dog collar. Under 18 lbs — the small dog collar. Cats and kittens have their own collar.
How do I know when to replace it?
Replace the collar 8 months after you put it on. Writing the date on the calendar is the easiest way to remember.
Need a hand choosing?
Tell us your pet's weight and age and we will point you to the right collar or set.
- Email us
[email protected] - Answers on weekdays
References
*Elanco Animal Health, data on file. Seresto is described by Elanco as water-resistant; under normal conditions effectiveness lasts for 8 months — see the label in the box for how bathing and swimming affect the duration.