Seresto for dogs kills and repels fleas and ticks for 8 months in an easy-to-use, odorless, non-greasy collar. With Bayer's innovative Sustained Release Technology, this revolutionary collar offers hassle-free, continuous protection from fleas and ticks.Seresto is a unique polymer matrix collar that offers a continuous supply of two active ingredients: imidacloprid and flumethrin for effective 8-month protection against fleas and ticks. That's one convenient, non-greasy, odorless flea and tick collar instead of 8 monthly treatments.The active ingredients are stored within the collar. They are released in low concentrations and are distributed over your dog's hair and skin surface. As active ingredients wear off over time, the Seresto flea collar for dogs continuously replenishes the skin and hair coat with a new supply of active ingredients. In fact, fleas and ticks are killed through mere contact (No biting required).Key Benefits Long-Lasting: Repels and kills fleas and ticks for 8 months Fast-Acting: Kills fleas on dogs within 24 hours Quick-Tick Prevention: Prevents tick infestations within 48 hours Multiple-Tick Protection: Repels and kills deer ticks, American dog ticks, brown dog ticks, and Lone Star ticks Fast Flea Prevention: Existing fleas are killed within 2 hours and new fleas repelled before they lay eggs Home-Protection: Seresto aids in control of flea larvae in the dog's surroundings following contact with a Seresto-treated dog Continuous Protection: Bayer Polymer Matrix ensures that both active ingredients are continuously released in low concentrations Enhanced Night Visibility: Comes with 3 light reflectors that easily clip on to the collarPrecautionsFor external use on dogs over 7 weeks of age up to 18 lbs (8 kg). Do not use on other animals. 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 senstivities, while rare, may occur after using ANY pesticide product for pets.Rarely, mild application site reactions may occur, such as scratching, redness and hair loss, which usually recover within 1 to 2 weeks without the need for collar removal. In some cases, a temporary collar removal and bathing may be recommended untul symptoms have disappeared. In very rare cases, application site reactions such as dermatitis, inflammation, eczema or lesions may occcur. In these instances, collar removal is recommended. 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.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 for flea control and reduced to 7 months for tick control.