Advantage Multi for Dogs prevents against heartworm disease, has flea control of Advantage®, and the treatment and control of intestinal worms (hookworms, roundworms and whipworms) – all in one, convenient, monthly topical solution. Key Benefits: Prevents heartworm disease caused by Dirofilaria immitis, as shown in clinical trials. Treats and controls hookworm infections caused by Ancylostoma caninum and Uncinaria stenocephala (adults, immature adults and fourth stage larvae). Treats and controls roundworm infections caused by Toxocara canis (adults and fourth stage larvae). Treats and controls roundworm infection caused by Toxascaris leonina (adults). Up to 98.6 percent effective treatment and control of whipworm infections caused by Trichuris vulpis (adults). Safe and effective, when used topically as directed, for dogs and puppies that are at least seven weeks of age and that weigh at least three pounds.