Insecticides for Use on Cats and Dogs It is important that all cats and dogs in the home are treated at the same time to avoid potential reinfestation from each other. Read all insecticide label directions carefully before buying insecticides and again before applying them to ensure their proper use. Be sure the intended insecticide is labelled specifically for animals. When applying the insecticide, do not get it into the pet's eyes or mouth. Do not repeat more often than is recommended.
Dips commonly contain either permethrin or chlorpyrifos.
Sponge or swab the pet with the insecticide until the pet is thoroughly wet to the skin. Allow to dry. Do not rinse or towel the pet. Rub the dust into the fur against the natural lay of the hair until it penetrates to the skin. Flea collars are not suggested for pets.