Hi everyone. This has been bothering me for a while: I did extensive research to make sure the kibble I feed my 1 year old dog is free of animal by-products and has all the nutritional content he needs. For chews, we give him things such as antlers, bully sticks, and other digestible cow parts. My question is this: aren't all these chews made from these "horrible" by-products? Aren't trachea, gullets, etc. by-products? What makes it ok to give as a chew but not ok to put in the food? Am I missing something?