K9 Advantix II Flea and tick prevention for dogs is a vet-recommended dog flea and tick treatment that also kills and repels mosquitoes, a benefit not found in many other flea and tick products. Some products require a flea or tick to bite your dog in order to work. K9 Advantix II for dogs works through contact, so fleas, ticks and mosquitoes don’t have to bite your dog to die. Just one application of Bayer K9 Advantix II kills fleas, ticks and mosquitoes for 30 days. The formula starts to work within 12 hours of application to kill fleas and keeps working for one month. Do not use on cats; use only on dogs. Product Features: K9 Advantix II for dogs works through contact, so fleas, ticks, and mosquitoes don’t have to bite your dog to die K9 Advantix II topical tick and flea control for dogs is easy to apply starts working to kill fleas within 12 hours and keeps working for 30 days Veterinarian recommended Bayer K9 Advantix II for dogs also repels biting flies and kills lice Contains 4 monthly applications of K9 Advantix II dog flea and tick treatment