Barkworthies Big Cheese Chew Medium Barkworthies Big Cheese Chews (Medium) offers your medium-sized, aggressive chewer a long-lasting alternative to everyday chews! Based on a generations-old recipe from the mountains of Nepal, these all-natural, nutritious chews are made from yak's and cow's milk. Completely digestible as well as grain and gluten free, Barkworthies Big Cheese Chews last up to five times longer than your average rawhide chew. They can provide many hours of enjoyable chew time. Most Barkworthies' all-natural dog treats and chews are completely preservative-free and additive-free. Please note that this product is not for human consumption. Please supervise your pet while giving a treat or chew and dispose of properly if it becomes a choking hazard or develops sharp edges.