PetArmor Plus Flea and Tick Prevention for Dogs, Dog Flea and Tick Treatment, 6 Doses, Waterproof Topical, Fast Acting, Medium Dogs (23-44 lbs)EFFECTIVE, WATERPROOF FLEA TREATMENT FOR DOGS: PetArmor Plus is a waterproof, flea and tick topical prevention for dogs that kills fleas, flea eggs, flea larvae, ticks, and chewing lice for up to 30 days after application. TRUSTED, VET QUALITY FORMULA: Containing fipronil and (S) methoprene, the same active ingredients as FRONTLINE Plus for Dogs. PetArmor Plus for Dogs has a powerful formula that starts to kill fleas within 24 hours. BREAK THE FLEA