Take a look at this link that was shared with me today.  It's about the worst inexpensive dog foods you can feed your dog.    http://recipes4gourmetdogs.com/2011/08/worst-dog-food-brands/  If you poke around more on the site there is also a list of the best dog foods and ingredients you should look for.  We all love our dogs and want them around as long as possible.  Their lives are short compared to ours so do what you can to improve their quality of life and possibly their quantity.