Hookworms and roundworms can be a common problem in puppies and dogs that are exposed to infected environments. These worms can even be passed to humans! PetArmor Sure Shot 2X (pyrantel pamoate) controls and prevents reinfestation of roundworms (Toxocara canis and Toxacaris leonina) and hookworms (Ancylostoma caninum and Uncinaria stenocephala). This vet-quality deworming liquid wormer is safe for dogs up to 120 lbs.