Himalayan Refills for Ruffhides Refillable Wraps - 2 count Mini Size It comes from an ancient recipe of the people of the Himalayas. The perfect fit for your Mini Size Ruffhides, these tasty Himalayan Dog Chew refills are made from all-natural Yak and Cow milk. Feel great about offering chews to your pet, knowing they&#39;re free of chemicals and preservatives. 100% Yak and Cow Milk. Salt and Lime Juice. In the mountains at more than 15,000 feet, it is made using traditional methods with Yak and Cow Milk, all natural products and no chemicals or preservatives.