I purchase Waggin' Train Yam Good dog treats for my dog because they are nutritious and made from natural ingredients.  I was looking for a treat that had no artifical flavors or colors and especially no by-products, chemicals or fillers.  In fact, the only ingredients in this product are: chicken breast, yams and natural flavoring.  I expected that a natural treat like this would be made by Iams or Science Diet.  But now that I've found a natural snack for my dog, I'm sticking with Waggin' Train treats.  Nothing but the best for my dog!!