What is the best food for little dogs (Boston Terrier) and what does feeding by life stages mean? I was talking to a women in a pet store and we were looking at good dog foods and she asked if I planned on feeding by life stages. I don't really know what that means. Is it harmful to the dog if you don't? All this stuff is really confusing to me. I want a good dog food that isn't going to put me in the poor house; Is it even possible?