The last time my Yorkie girls ate commercial food was at the breeders. Since I got them they have only eaten "real" food and have never had a sick day in their lives. The reasons are all over the internet why commercial pet food is so dangerous. Severe medical problems are caused by commercial pet foods and treats, as well as over inoculating and flea and tick products.
What’s Really in Pet Food Pet vaccination warning. Severe adverse reaction to immunization EPA Evaluation of Pet Spot-On Products: Analysis and Mitigation Plan | Pesticides | US EPA