Surprisingly what it actually is a basically a type of cheese. Most of them are made of yak and cow milk with some salt and lime juice. It is nice to see a short and easy to understand ingredients list.
All of the brands that I have looked at source their product from Nepal where a similar substance is made for human consumption called churpi. There seem to be some other variants that might be made elsewhere in a less traditional way, like the Milkotein bars.
These chews are very hard, almost as hard as antler and probably about as hard as bone. So if you have a dog that makes short work of rawhide and bully sticks this might represent more of a long term challenge. Some of the brands such as churpi-chews and Yeti chews seem to be less popular as they are softer and so dogs finished them more quickly.
|_tar0_ / Foter|
These chews are so hard that I guess my dogs just never got the idea that they should be chewed on. Some dogs may be sensitive to the ingredients. I might need to try those softer versions other people are complaining about!