OK...you piqued my interest, so I did some research. Most of the so-called "good" dog foods have nasty additives and prro quality ingredients (chicken by-product, etc).
I came across Orijen and it is awesome, but very expensive. The next best thing appears to be Chicken Soup for the Puppy Lover's Soul. Much more affordable! It appears that they USED to use a preservative that is NOT recommended, but with pressure have stopped. Here is the information for it:
Dog Food Reviews - Chicken Soup For The Puppy Lover's Soul - Powered by ReviewPost