Yak Cheese Chews come in 4 sizes: small, medium, large and x-large. Large is perfect for 45 pounds and up. Yak Cheese is a long lasting chew that your pup will love! No smell, no mess, high protein, almost zero fat and lots of delicious! If you have small pieces leftover from the treat, you can gather them and put in the microwave for 30-40 seconds to create a new crunchy treat. Keep cooking until it makes a puffy cheese treat. Make sure to let it cool first before giving them to your pet to enjoy! The amount of time is takes for a dog to devour the treat depends on several factors such as the size of the pet and chewing habits. The hard texture of the cheese makes it a long lasting dog treat, keeping your pet occupied for hours, even days!