PetArmor Flea & Tick Protection For Cats, 3-month supply: Kills adult fleas, ticks and chewing liceFast actingLong lastingWaterproofCosts lessApproved for use on kittens 8 weeks and older *PetArmor for Dogs and PetArmor Plus for Dogs are to be used only on dogs. PetArmor for Cats and PetArmor Plus for Cats are to be used only on cats. As with all medications, please read and follow label instructions. PetArmor for Cats provides the same #1 veterinarian-recommended active ingredient, Fipronil, in the same concentration as Frontline. You get the same flea and tick protection as Frontline at a significant savings.