PETARMOR Plus for Dogs, Kills Fleas, Ticks and Lice (45-88 lbs) PetArmor Plus kills fleas, flea eggs, flea larvae, ticks and chewing lice for up to 30 days The fast-acting, long-lasting squeeze-on contains the #1 vet-recommended active ingredient3, fipronil, and (s)-methoprene, the same active ingredients used in FRONTLINE Plus. This waterproof formula breaks the flea life cycle by killing flea eggs and larvae for up to 12 weeks Kills ticks that may transmit Lyme disease. PetArmor Plus is just as effective against fleas and ticks as FRONTLINE Plus.