Extra Large Dogs Over Over 55Lb, K9 Advantix Ii Topical Flea & Tick Treatment Kills fleas, ticks and mosquitoes through contact, no biting requied. Kills all life stages and prevents fleas on treated dogs from re-infesting your home Veterinarian Recommended Also kills lice and repels biting flies Convenient, easy to apply monthly topical for use on dogs or puppies 7 weeks of age or older