I forgot to mention that DogAware also has a lot of information on raw diets, raw suppliers, home cooked diets and supplements to different diets. It also has some health and disease information, including some information on special needs diets.
We feed Taste of the Wild at the moment.
Another web site with information is http://www.dogaware.com/
Here's the diet page. http://www.dogaware.com/diet/index.html
On the dry dog food page, you can click on the name of the dog food company in the left hand column and it will take you to...