Ok - here is the skinny.

You should avoid foods with lots of fillers, ie: corn, soy, brewer's rice, and other things along this line. You should also avoid foods with meat-by-products. If you must shop at your local grocery for foods then you are going to have to do your research and read labels.

If you live in the sticks, then chances are there is a feed store near you somewhere. Most feed stores carry some of the better foods. Also, if you live in the sticks, chances are you are going to "the city" every once in a while. While you are there - get dog food.