Frontline Plus 3 Packs Purple Supply Size: 3 Month Supply, Pet Weight: 45 to 88 lbs Features: -Once a month flea control for dogs.-Kills flea eggs and larvae and prevents development of new fleas.-Protects against Lyme Disease. Specifications: -Kills fleas, ticks and chewing lice within 48 hours of application and continues to work for 4 weeks.