By the way, the collagen roll is incredibly durable. My pit mix can crack bones in half but she barely made a dent in the collagen after an hour of chewing.@Chickengirl2671 I just wanted to thank you for making this thread. I hadn't heard of some of these chews before this. I found beef cheek rolls and collagen rolls at a local pet store and gave them to my dogs last night. So far so good!! No one has diarrhea and they finally have a something "real" to chew on. Dorie is currently trying to bury hers to hide it from Luna.