Frontline® is a fast-acting, long-lasting topical treatment that is 100% waterproof and designed for the control and treatment of fleas, ticks and chewing lice. Formulated for adult dogs and cats as well as puppies and kittens who are 8 weeks of age or older, this spray helps stop existing infestations and helps prevent new infestations from occurring by killing fleas, ticks and chewing lice for at least 30 days.