Its the kneecap, a very safe beef bone for all sizes of dogs. The Tartar Buster is excellent for cleaning teeth and keeping gums healthy. Your dog will chew and scrape their teeth at all different angles on this bone, cleaning areas of the mouth other chews just wont get to. This bone is dry roasted, not smoked and not over cooked. Theres not a lot of excess fat on this bone and theres no marrow inside. Its both the fat and the marrow of other bones that sometimes upsets sensitive tummies.