Long-lasting topical treatment that kills fleas and ticks and controls infestations of chewing lice. It works quickly to not only rid your cat of these pests, but keeps working to prevent them from coming back. This spot treatment is safe for kittens and cats that are at least 8 weeks old and 1.5 to 22 pounds. Onguard Plus keeps new flea eggs from hatching and rids your pet of adult fleas that can cause flea allergy dermatitis for up to 6 weeks. This powerful formula keeps killing Brown dog ticks, American dog ticks, Lone Star ticks and Deer ticks that may carry Lyme disease for up to a month. Onguard Plus is long-lasting and waterproof, so it still offers protection even after a bath or if your cat’s fur gets wet.