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EFFECTIVE, WATERPROOF FLEA TREATMENT FOR CATS: PetArmor Plus is a fully waterproof, flea & tick topical prevention for cats that kills fleas, flea eggs, flea larvae, ticks, and chewing lice for up to 30 days after application. TRUSTED, VET QUALITY FORMULA: Containing the same active ingredients as Frontline Plus for Cats, PetArmor Plus for Cats has been trusted by vetinarians for nearly 20 years due to a powerful formula that kills fleas within 24 hours of application. BREAK THE FLEA CYCLE: Unlike other flea and tick treatments that may just temporarily suppress flea activity, PETARMOR Plus Cat Flea Treatment works by breaking the flea cycle entirely! Kill flea eggs and larvae for up to 12 weeks.