I've tried many different brands, right now I'm using Natural Balance. It's seems like a great food to me. Here's their website http://www.naturalbalanceinc.com/

And here's an ingredient listing:
Chicken, Brown Rice, Duck, Lamb Meal, Oatmeal, Pearled Barley, Potatoes, Chicken Fat (preserved with mixed tocopherols-a source of Vitamin E, Citric Acid, and Rosemary Extract), Natural Flavor, Tomato Pomace, Canola Oil, Brewers Yeast, Lecithin, Choline Chloride, Carrots, Potassium Chloride, Whole Ground Flaxseed, Dried Kelp, Salt, Parsley Flakes, Calcium Carbonate, Zinc Proteinate, Ferrous Sulfate, Zinc Sulfate, Vitamin E Supplement, Vitamin B-12 Supplements, Ascorbic Acid (vitamin C), Taurine, Yucca Schidigera Extract, L-Lysine, Manganese Sulfate, Niacin, Riboflavin Supplement (Vitamin B-2), Copper Proteinate, Grape Seed Oil, Copper Sulfate, d-Calcium Pantothenate, Vitamin A Acetate, Inositol, Folic Acid (Vitamin B, Pyridoxine Hydrochloride (Vitamin B-6), Thiamin Mononitrate (Vitamin B-1), D-Activated Animal Sterol (source of Vitamin D-3), Biotin, Ethylene Diamine Dihydriodide (source of Iodine), Cobalt Sulfate, Menadione Sodium Bisulfate Complex (source of Vitamin K activity), Sodium Selenite.

I think the most important aspect in finding a good dog food that is best for your dog is to read the ingredients. There's many things to think about but the main ones that I look for are no bi-products and meat as the first ingredient.