Lots of people watch their dog deteriorate on commercial foods simply because they either don't know what else to feed, how to feed it or that they do need to feed something better in order to obtain or maintain optimal health.
When dogs are switched to bones and raw food, health problems either improve or disappear. By making such a remarkably simple but profound change in your dog's diet you will quickly discover what so many other dog owners on raw already know.
BARF/Natural Diet Links
Dr. Billinghurst's own site