The Yak Dog Chew is natural and very long-lasting dog chew. These Himalayan Yak Milk Dog Chews are made by boiling yak and cow milk and then dried for weeks to create a hard chew. Dogs must work the end of the treat for hours, which keeps your dog busy for hours, softening it with their mouths before small parts of it can be slowly scraped off. It is 100% natural with zero preservatives and the best alternative pet parent can give to their fur baby.