Yellow Yak Yum starts with a favorite ingredient - cheese. Using a traditional Himalayan recipe, these chews are lactose, gluten, and grain free, 100% natural, and easily digestible! Yellow Yak Yum is a medium density chew that is great for all chewers! It lasts about as long as a bully stick of the same size.,Yellow Yak Yum starts with a favorite ingredient - cheese. Using a traditional Himalayan recipe,