Long before they became a dog chew, Himalayan herders made this hard cheese from yak milk. Here's how it's made and what to check before you buy. If your dog destroys ordinary chews in minutes, you've probably seen yak cheese chews and wondered what they are. Here's what you're actually giving your dog. A cheese with centuries of history In the high Himalayas of Nepal, people have made a hard cheese called chhurpi for generations. It's dried until it's rock-hard and lasts for months without refrigeration, which matters at altitude. Locals still eat it as a long-lasting snack. The same...