Say goodbye to those pesky fleas! K9 Advantix is a once a month topical flea treatment that has two active ingredients, imidacloprid, and permethrin that combine to attack the parasites nervous system at different areas. Not only does K9 Advantix kill and repel fleas and stops from biting, it also kills and repels mosquitoes, chewing lice, ticks, and stops ticks from attaching. If you need to wash your dog within the month of application, not a problem! Feel free to give your dog a bath or let them play in the rain because K9 Advantix is waterproof. Be sure to bath your furry friend in non-detergent shampoo for best results.