K9 Advantix II for Dogs over 55 lbs - 4 Count K9 Advantix provides protection from more biting pests than the leading competitor. For dogs 7 weeks of age and older weighing 55 lbs and over. It not only kills ticks, fleas and mosquitoes, it also repels them! EPA Est. No. 11556-DEU-1. EPA Reg No. 11556-14