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Seresto for Dogs

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Product Overview

How To Use

What’s in it?


Questions & Answers

Product Description

Seresto for Dogs offers a state-of-the-art delivery system that kills fleas rapidly and prevents ticks and fleas for as long as 8 months after administration. See Allivet's Flea and Tick Chart to find which flea and tick product is best for your pet.

What is Seresto for Dogs?

With its innovative delivery system, Seresto™ quickly kills fleas on dogs and prevents fleas & ticks for up to 8 months.

Who is Seresto for Dogs for?

For use in dogs 7 weeks old and up. Small dog dose is for dogs under 18 pounds, and large dog dose is for dogs over 18 pounds.

Why use Seresto for Dogs?

Features of Seresto:
  • Kills fleas, which can cause flea bite hypersensitivity (FBH) or flea allergy dermatitis (FAD)
  • Helps control and treat Sarcoptic mange
  • Light reflectors offer evening and night visibility
  • Helps control the larvae of fleas in the surroundings of treated dogs after contact
  • Kills fleas before they have a chance to lay eggs
  • Repels or kills re-infesting ticks within 6 hours
  • Prevents infestation of ticks within 48 hours post-application
  • Quickly kills fleas within 24 hours of treatment and continues treating infestations for 8 months

How does Seresto for Dogs work?

Seresto helps control flea larvae in the dog's environment following contact. Bayer's Polymer Matrix guarantees that both of the active ingredients in Seresto are continuously, slowly released in low concentrations.


Bayer Animal Health

Active ingredient(s):

Flumethrin*, Imidacloprid

How is Seresto for Dogs sold?

Sold in a 1 or 2 pack depending on your dog's size.
Small Dogs (Up to 18 lbs)
Large Dogs (Above 18 lbs)

What are the side effects of Seresto for Dogs?

The following side effects could occur:
  • Slight itching, especially in the first few days after fitting
  • Mild skin reactions
  • Slight hair loss
If these or any other reactions occur, inform your veterinarian.

What special precautions are there?

Collars should be replaced every eight months to maintain year-round prevention of pests.

What to do if overdose?

Contact your closest emergency pet hospital

How can I store Seresto for Dogs?

Keep out of reach of children.
Throw away expired collar, container, and pouch in trash.
Don't contaminate feed, water, or food by storage or disposal.

Helpful Tips:

Seresto kills and prevents ticks for up to 8 months, including Deer ticks (a carrier of anaplasmosis and Lyme disease), American dog ticks (carrier of ehrlichiosis and Rocky Mountain spotted fever), Brown dog ticks (carrier of bartonellosis, anaplasmosis, ehrlichiosis, canine hemoplasmosis, Rocky Mountain spotted fever, and babesiosis), and Lone Star ticks (carrier of ehrlichiosis). This convenient collar does not have to be removed while your dog is swimming or being bathed.


Keep the collar in the bag and in the outer packaging until use. As with any pesticide product, do not allow small children to play with the collar or reflectors, or to put them into their mouths. Avoid contact with eyes, skin or clothing. Wash thoroughly with soap and cold water after fitting the collar. People with sensitivity reactions to the ingredients of the collar should avoid contact with the collar. Choking hazard. Contains small parts. Do not place collar or reflectors in mouth. Not intended for use on humans.
For external use on dogs only. Do not use on other animals. Do not use on puppies under seven weeks of age. Do not get this product in dog’s eyes or mouth. As with any product, consult your veterinarian before using this product on debilitated, aged, breeding, pregnant, or nursing animals. Individual sensitivities, while rare, may occur after using ANY pesticide product for pets. If signs of sensitivity occur, remove collar and bathe your pet with mild soap and rinse with large amounts of water. If signs persist, or become more severe, consult a veterinarian immediately.

Main Ingredients

Active Ingredients: % by Weight
Imidacloprid …………………… 10.0%

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Seresto for Dogs

Customer Submitted Questions

Is it harmful to humans?

1 Answer

do you need a prescription for this?

1 Answer

How long is a new unopened soresto collar good for?

1 Answer

Is it waterproof?

1 Answer

These collars come in small & large however not sure how those sizes run. My dog is not tiny or big I would say the 26 to 50 lbs range. Which one should I get???

1 Answer

Is this safe for a 7 lb Chihuahua? All the reviews I’ve seen mention larger dogs. Thank you.

1 Answer

Will "large dog" fit an 80 to 100 pound wolf hybrid?

1 Answer

What are the lengths of the small and the large collars?

1 Answer

My dogs neck is 23 inches. Will the large fit?

1 Answer
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