The Original Himalayan Dog Chew is a very long lasting dog chew. Himalayan Dog Chews are made by boiling yak and cow milk and then dried for several weeks to create a hard chew. Dogs must work the end of the treat for hours, softening it with their mouths before small parts of it can be slowly scraped off. It is 100-percent natural with no preservatives. It is an authentic type of cheese eaten by the people of the Himalayas.