Worm Protector 2x Liquid Wormer for Dogs and Puppies removes large roundworms and hookworms. Worm Protector 2x Liquid Wormer is also used to prevent reinfestation of Toxocara canis in puppies and adults dogs and in lactating bitches after whelping. Active Ingredient: 4.54 mg of pyrantel base as pyrantel pamoate per mL.