These are VERY hard pieces of Himalayan Yak Cheese, plain and simple. They really like them a lot for CHEWING on. I can hear their little teeth grinding away on them, but they have the cleanest dog teeth in town! LOL So these are a special treat, just like they come from the bag
--- OR ---
I have discovered that if I put one on a plate and stick it into the microwave for a minute or two in 30 sec. intervals (until it PUFFS UP) and then cool it for about 3-5 min. (until cool enough for my pups), they get served a nice big puffy warm piece of YAK cheese -- and they go after it with a vengeance! One of their favorite treats!