SmartBones chews are made with real chicken and provide your dog with needed chewing exercise and great taste. SmartBones are rawhide-free and contain real chicken filet wrapped in a chicken flavored vegetable chew. It is the first chew of its kind to be fortified with vitamins and minerals. Medium sized SmartBones are suitable for dog breeds 20 to 40-pound. Independent digestibility studies show that SmartBones chews are over 99-percent digestible and tests demonstrate that 9 out of 10 dogs prefer SmartBones chews over the leading rawhide chews. SmartBones are the healthy alternative to rawhide.