K9 Advantix® offers 5-way protection. The one that repels and kills ticks, fleas and mosquitoes also repels biting flies and kills chewing lice, providing protection from more pests than other topical products.Does your dog love the water? No problem! K9 Advantix® is waterproof. Studies have shown your dog will still be protected after exposure to water (i.e., bathing, swimming or rain). For optimum results, use a non-detergent shampoo when bathing your dog. K9 Advantix is the only topical product that repels and kills ticks, fleas and mosquitoes while repelling biting flies and killing chewing lice too.