I know the pioneers fed their dogs from table scraps, long before commercial pet foods. But how long did they live, and how healthy did they live? We don't know. I've had three black Lab mixes. I fed they all the cheapest commercial dog food, mostly bag food. The first two were healthy all their lives and lived to be 16 and a half. Annie 12 and also healthy. I give her a little bag dog food and a third of a can of dog food morning and evening and she's doing fine. Loves the stuff. I also treat her to licking a pot and a plate and she loves that even there isn't much in them. But I know what you mean that commercial dog food in a bag or a can can be suspect. Some recently, from China, was killing dogs. We need to watch them and see if their food is causing them any problems.