Safe-Guard 4-in-1 Dewormer (fenbendazole) is recommended for the removal of Roundworms, Hookworms, Whipworms and Tapeworms. Safe-Guard is safe for young puppies over 6 weeks, pregnant females and heartworm infected dogs. Safe-Guard provides 100% control of Whipworms and Taenia Tapeworms, and nearly 100% control of Hookworms and Roundworms. Dogs should be treated every six months. 1 Gram.