Refill nuggets for the Puff & Play Toy. All-natural hard cheese made from yak milk, cow milk and lime juice. No added salt or preservatives. Traditionally made for human consumption, this smoky hard cheese has become a favorite for dogs. Microwave each nugget for approximately 60 seconds; it will puff up to twice its original size. Let it cool and let your dog enjoy! Virtually no odor and leaves no stain. Imported from Nepal, made in the Himalayan region.