I use Taste Of the wild, it is sold at Care-a-lot. it only contains natural ingredients, no by products, corn or gluten. my 2 year old and 9 week old Pitts love it
As mentioned by Matt, the page on this site has some well thought out and researched selections. One thing I would like to add; just about all dog food has fillers. If it has potatoes, beats, corn, rice or something equivalent, it has fillers.