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 drying 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. Packaged by weight, quantities and size vary.