I wouldn't be so quick to discount this. One of the things I feed my dog is lamb tripe (stomach tissue and contents). It smells gross, but he absolutely loves it! It is considered to be very nutritious, and also a good source of enzymes. We've really gotten very "soft" with what we consider edible--most of us won't even eat organ meats, which were once considered delicacies. It's really important to eat as much of the animal as you can, if that is your only sustenance.