Was born from an ancient recipe for a hard cheese snack chewed by the people of the Himalayas. In the mountains surrounding Mt. Everest at more than 15,000 feet, it is made using traditional methods with yak and/or cow milk, and all natural products with no preservatives or binding agents. They're also gluten-free! Depending on the size and eating habits of the dog, this can be a very long-lasting dog chew. Dogs must work the end of the treat for hours, softening it with their mouths before small parts of it can be slowly chewed off. When you give this treat to your dog, you know that you are providing them with high-quality eating entertainment.