Yak Chews come from an ancient recipe of the people of the Himalayas. In the mountains at more than 15,000 feet, they are made using traditional methods with yak and cow milk. These chews are 100% natural with no added chemical preservatives. When you give this treat to your dog, you know that you are providing them with hours of high quality chewing and entertainment....naturally. Gluten Free, 52.6% protein.