Was born from an ancient recipe for a hard cheese snack chewed by the people of the Mongolia. 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.