This dog dewormer is a single treatment for the removal of large roundworms (Toxocara canis and Toxacaris leonina) and hookworms (Ancylostoma caninum and Uncinaria stenocephala). The dewormer for dogs prevents the reoccurrence of a large roundworm infestation. This vet-quality deworming treatment is safe for dogs up to 120 pounds. For maximum control and prevention of flea reinfestation, it is recommended that puppies are treated at 2, 3, 4, 6, 8, and 10 weeks of age. See packaging for dosages. Store this SENTRY flea and tick prevention below 30 C (86 F).