For years I have spreading the information about dog foods, but only a few listen. I always hear the excuse, "I don't cook for us, so why should I cook for a dog". Or, "I don't have the time". It goes on and on. If you read the threads here and on other dog sites, you will read about lots of sick dogs. These dogs are ALWAYS fed dog food. Buy the book by Ann N. Martin titled FOOD PETS DIE FOR! She's had the dog food industry in and out of court for years.
Here are more sites about what goes into dog food:
http://www.homevet.com/petcare/foodbook.html http://www.nexusmagazine.com//Petfood.html http://www.api4animals.org/doc.asp?ID=79