Sentry HC WormX DS Liquid Wormer is for the removal of large roundworms (Toxocara canis and Toxascaris leonina), and hookworms (Ancylostoma caninum and Unciaria stenocephala) in dogs and puppies. WormX Ds can also be used to prevent reinfestation of Toxocara canis in puppie and adult dogs and in lactating bitches after whelping.