Keep your dog protected with the number 1 name in flea & tick protection (1), FRONTLINE. FRONTLINE Plus for Dogs is a fast-acting, long-lasting waterproof flea & tick topical that's proven to kill fleas, flea eggs, flea larvae, chewing lice, and ticks that can transmit Lyme disease. Break the flea life cycle — FRONTLINE Plus for Dogs is specially formulated with fipronil and (S)-methoprene to kill existing adult fleas, flea eggs and flea larvae to guard against further infestations for flea control.