Frontline Top Spot Blue for dogs and puppies provides flea and tick protection for at least one month. It is applied topically and each packet has 3 applications providing 3 months of protection.Effective Flea & Tick Control . . . No Prescription Required!Guaranteed US EPA approved. Over-The-Counter topical kills fleas & ticks in under 48 hours Protect against Lyme Disease! Easy to apply monthly preventive