PetArmor Plus for Cats 3 Dose Box PetArmor Plus Flea & Tick Topical Prevention for Cats kills fleas, flea eggs, flea larvae, ticks, and chewing lice for up to 30 days after application This vet-quality formula begins killing fleas & ticks within 24 hours and may take up to 48 hours PetArmor Plus works by breaking the flea cycle, and killing flea eggs and larvae for up to 12 weeks Flea and tick treatment comes with three (3) 0.017 fl. oz. waterproof topical applications Flea and tick prevention for cats protects your furry family member from brown dog ticks, American dog ticks, lone star ticks, and deer ticks (which may transmit Lyme disease)