Drontal Chewables are tasty chewables made from real liver that treat your dog for all major species of gastrointestinal worms including roundworm, hookworm, whipworm and tapeworm. They also controls shedding of Giardia oocysts.Treats and controls all major intestinal worms including roundworm, whipworm and hookwormControls tapeworms, including the hydatid tapewormControls shedding of Giardia oocysts