Hartz UltraGuard Plus Rid Worm Tablets for Small Dogs Removes: * Large roundworms (ascarids) (Toxocara canis, Toxascaris leonina) * Hookworms (Ancylostoma caninum, Uncinaria stenosephala) * Prevents the re-infestation of Toxocara canis in dogs and puppies and in lactating bitches after whelping. * For use on puppies 2 weeks of age or older