I started with barf, but my dog didn´t like the vegetables and fruits in the meat. A friend of my told my about Prey so I took some time to inform and started to feed with this model. My dog has a binding skin, a shiny coat, good teeth and she´s more relaxed and balanced. I feed whole prey, so that it´s work for her to use her teeth to get to the meat inside the animal. She has minimal output since I feed like this.