I feed raw meat to one of my cats because he can't digest even the grain free stuff. It's been about 10 months now and his digestive tract has just now gotten back to normal but the base meat consists of venison, elk, or bison. To that, I add calcium, taurine, Missing Link, and a multivitamin. I would love to use whole foods but unfortunately he just gives me any mice he catches (still alive) and refuses to eat whole ground up chicken legs/thighs which are a staple for many raw food cat diets. In this case, I wouldn't feed raw unless I had to but his digestive tract not only disagrees with commercial food (holistic, organic, grain-free or otherwise) to the point that it wasn't processing hardly any of it. I worry about raw food diets unless the animal does eat whole prey so they get all the good stuff which comes from the organ meat, etc. Bulls, on the other hand, would rather starve than eat liver, gizzards, hearts, or anything but wild game red meat...