My 4 year old heavy chewer LOVES these treats in the calming bone. He'll spend many hours a day chewing on it, licking on it, etc., and he carries the bones from room to room with him (in between naps). I put two in a day to each bone and leave them for him to find (though he's pretty much always right next to me, especially when he hears the bag being opened). Highly recommend. Yes,he chews on the end, but I can still get the treats in, and he can still get them out!