Himalayan Yaky Charms Dog Popcorn Treat, Pack of 3Himalayan Dog Chews are made by boiling yak and cow milk and then dried for several weeks to create a hard chew. It is 100% natural with no preservatives. From the beginning, we have tried numerous ways to utilize leftover Himalayan Dog Chews. After extensive research and hundreds of attempts later, we discovered that when Yaky Nuggets are microwaved, they puff up to about five times their original size. The result is a dog treat that is not too soft