we have hunting dogs (quite a few of them) and feed flesh to ours. We have a small deer processing / farm slaughterhouse near us and are able to pick up (for free) all of the carcases that we want. Rib cages, spinal collumns, heads, legs, feet, etc. We were feeding kibble during the summer when the dogs are "off" during the non-hunting season and had started excercising them and they were dragging their feet. A few days back on flesh and they are raring to go. We feed Vegetables twice a week and they get bread periodically. All of this is free or very cheap from markets and farmers in the area. Yes, it takes some work but cheap and free is good enough reason for me!