For protecting dogs from different intestinal worms, Drontal Allwormer for dogs is the ultimate product. These broad-spectrum formula destroy various intestinal worms including roundworms, whipworms, hookworms and tapeworms. This simple to dose treatment is easy to administer in dogs. Used every 3 months, Drontal not only protects your dog from worms, it also helps protect the whole family from the harmful effects of contracting worms from your dog.