K9 Advantix II Large Dog 30-day treatment & prevention protects dogs 21-55 lbs. from fleas, ticks, mosquitoes, biting flies and lice     Kills fleas within 12 hours of application     Vet-recommended formula kills & repels on contact so fleas don’t have to bite your dog to die     Easy-to-apply topical treatment is fragrance-free and waterproof after 24 hours     No prescription needed ›  See more product details