K9 Advantix II offers broad spectrum protection against fleas, ticks and mosquitoes, too. It is specifically formulated for dogs and comes in a convenient, monthly topical application that not only kills but also repels fleas, ticks and mosquitoes. K9 Advantix II also kills ALL life stages of fleas, repels biting flies and kills lice. K9 Advantix II is for use on dogs 7 weeks and older and weighing 4 lbs or more. Do not use K9 Advantix II on cats.