I have been doing a lot of research and found that most commercial dog food has a lot of preservatives in it, chemicals and fillers that you really don't want your dog to eat. Bad things. Here are two really good articles you can read about it.
http://www.belfield.com/article3.html http://www.wholisticanimal.com/commercialfood.html
So anyway, I've decided that since I like to eat healthy food, I'm going to let my yorkie try it. I ordered several samples off the internet and went to a specialty dog food store here in town and got several samples and brought them home. I tried them as treats first, then I put some in individual dishes to let her try them. She couldn't get enough! In particular, Karma by Natura dog foods - all of the ingredients are certified organic and of the highest quality. All of the meat is free range. I haven't fully switched her over yet, but am in the switching process. I'm buying all natural dog treats, which she loves -- and her coat is shinier, she's more playful -- I can definitely see a difference when eats this stuff. Its a tid bit more expensive, but I think its definitely worth it to have a happy healthy pet!! There are a few other organic dog foods under different brand names, and if you are interested in this, do some research and try out some natural or organic dog food to see how your dog likes it!!
Rachel