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Seresto provides a water- and shampoo-proof, non-greasy, easy-to-use collar that offers a full 8 months of flea and tick prevention, and controls flea larvae in the pet's immediate surroundings following contact with a treated pet. Seresto kills fleas within 24 hours and repels and kills ticks. Bayer's patented release technology stores active ingredients within the collar and releases them slowly and continuously through contact. For use on dogs 7 weeks and older, Seresto is also effective in treating biting/chewing lice for one month and aids in the treatment and control of sarcoptic mange. Seresto for dogs features a 2-step safety release system that prevents animals from becoming trapped. Active ingredients: imidacloprid 10% by weight and flumethrin 4.5% by weight.

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Small Dog [under 18lbs] 1 Collar
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Large Dog [over 18lbs] 1 collar
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For 8-month prevention and treatment of ticks and fleas on dogs and puppies 7 weeks of age and older and for small dogs up to 18lbs and large dogs above 18 lbs.

Repels and kills ticks for 8 months, including Deer ticks vector of Lyme disease and anaplasmosis, American dog ticks vector of Rocky Mountain spotted fever and ehrlichiosis, Brown dog ticks vector of ehrlichiosis, anaplasmosis, bartonellosis, canine hemoplasmosis, babesiosis, and Rocky Mountain spotted fever, and Lone Star ticks vector of ehrlichiosis.

Prevents tick infestations within 48 hours after application.

Re-infesting ticks are repelled and/or killed as quickly as 6 hours.

Quickly kills fleas on dogs within 24 hours and continues to prevent infestations for 8 months.

Treatment with Seresto kills fleas and may reduce the risk of tapeworm infections Dipylidium caninum, bartonellosis Bartonella vinsonii, Bartonella spp., and rickettsiosis Rickettsia felis, which are types of canine vector borne diseases.

Re-infesting fleas are killed within 2 hours with protection against further flea infestation lasting 8 months.

Kills fleas before they lay eggs.

Seresto aids in the control of flea larvae in the dog's surroundings following contact with a Seresto-treated dog.

Kills chewing lice for one month.

Aids in the treatment and control of Sarcoptic mange.

No need to remove collar when your pet goes swimming or gets bathed.

Bayer Polymer Matrix ensures that both active ingredients are slowly and continuously released in low concentrations.

Make sure to replace the collar after 8 months for year-round pest prevention.

Light reflectors for added visibility in the evening and at night.

Active Ingredients:

% by Weight Flumethrin* 4.5% Imidacloprid 10.0%

Other Ingredients:

85.5% Total 100% * Trans Z-1/trans Z-2 ratio: max 66% trans Z-1 and min 34% trans Z-2



Directions for use:


It is a violation of Federal Law to use this product in a manner inconsistent with its labeling. Do not contaminate feed or food.

How to Apply:

One collar per animal to be fastened around the neck.
Remove collar from protective bag directly before use.
Unroll collar and make sure that there are no remnants from the plastic connectors inside the collar.
Insert end of the collar through the buckle.
Adjust the collar around the animal's neck without tightening it too tight as a guide, it should be possible to insert 2 fingers between the collar and the neck.
Pull excess collar through the loops and cut off any excess length extending 1 inch 2 cm beyond the loops.
After application of the collar, three reflector clips may be fixed permanently to the collar to increase the animal's visibility in the dark.
Take the clips out of the bag. The clips should be evenly distributed on the non-overlapping part of the collar. The clips are correctly applied when a clicking sound is heard. For safety reasons once the reflectors are fixed to the collar the clasp closes permanently and cannot be re-opened.
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. This 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. Replace the collar after 8 months for optimal tick and flea protection.

Product Information:

Kills fleas which may cause flea allergy dermatitis FAD or flea bite hypersensitivity FBH. Seresto kills existing fleas on dogs within 24 hours. Reinfesting fleas are killed within 2 hours with protection against further flea infestation lasting eight 8 months. Pre-existing pupae in the environment may continue to emerge for six 6 weeks or longer depending upon the climatic conditions. Seresto aids in control of flea larvae in the dog's surroundings following contact with a Seresto-treated dog. Ticks already on the dog prior to treatment may not be killed immediately after collar application and may remain attached and visible. At the time of application remove ticks already on the dog. The prevention of infestations with new ticks starts within 48 hours after application of the collar. Re-infesting ticks are repelled and/or killed as quickly as 6 hours. Kills lice on dogs for one month. Aids in the treatment and control of Sarcoptic mange. Seresto is water-resistant and remains effective following a shampoo treatment, swimming or after exposure to rain or sunlight. Under normal conditions, effectiveness lasts for 8 months. In order to maintain an eight-month duration, dogs must not be bathed more than once per month. For dogs that swim once a month or more, the control duration is reduced to 5 months.

Possible Side Effects:

Occasionally slight itching may be observed in animals that are not used to wearing collars in the first few days after fitting. Ensure that the collar is not fitted too tightly. Slight hair loss and mild skin reactions due to the mechanical irritation of the collar may occur at the application site which usually recover within 1 or 2 weeks without the need for collar removal. If you notice any serious effects or other effects not mentioned in this leaflet, please inform your veterinarian.


In case of loss of collar, a new collar may be applied immediately. Do not attach a leash to the collar as this may cause breakage. 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. If your animal is on medication, consult your veterinarian before using this or any other product. If your dog is experiencing an adverse event, contact your veterinarian.

Storage and Disposal:

Do not contaminate water, food or feed by storage or disposal. Pesticide

Storage: Store in original unopened container in a cool, dry place that is inaccessible to children. Container Disposal: Dispose of container, pouch and expired collar in trash.

Bayer HealthCare LLC, Animal Health Division, warrants that this material conforms to the chemical description on the label.