Heartworm; Milbeguard Is A Once-A-Month Tablet That Prevents Heartworm Disease, Controls Adult Hookworm, And Removes And Controls Adult Roundworm And Whipworm Infections In Dogs And Puppies. It Also Prevents Heartworm Disease And Removes Adult Roundworm And Hookworm In Cats And Kittens. Milbeguard Requires A Prescription From Your Veterinarian.