I am looking for a substitute for rawhide. Otto, 14 mos, loves to chew these compressed bones but I have heard alot of negatives (after researching the boxer board of course ) He has been having bouts of diarrhea and upset stomach and I am ready to point the finger at the compressed rawhide he chews on. (just so you know he is being fed Nutro Natural Lamb and Rice adult formula so I don't think it's the food?). He loves to chew. What else can I give him besides rawhide? Is there anything else your boxers go completely nuts for?