Originally Answered: Science Diet or Pure Balance?
Dr. Dana is just proving that veterinarians receive crap education on animal nutrition.
This is the ingredients list for Science diet Adult Large breed food.
Whole Grain Corn, Chicken By-Product Meal, Soybean Meal, Animal Fat (preserved with mixed tocopherols and citric acid), Soybean Oil, Chicken Liver Flavor, Lactic Acid, Flaxseed, Iodized Salt, Dried Chicken Cartilage, Choline Chloride, Vitamins (L-Ascorbyl-2-Polyphosphate (source of Vitamin C), Vitamin E Supplement, Niacin, Thiamine Mononitrate, Vitamin A Supplement, Calcium Pantothenate, Biotin, Vitamin B12 Supplement, Pyridoxine Hydrochloride, Riboflavin, Folic Acid, Vitamin D3 Supplement), Vitamin E Supplement, Taurine, Potassium Chloride, Minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), L-Carnitine, preserved with Mixed Tocopherols and Citric Acid, Phosphoric Acid, Beta-Carotene, Rosemary Extract.
Yeah, really looks like real, healthy ingredients. The first thing on that list is corn, followed by by-product, which comes from a variety of disgusting sources it's not even funny.
If you're going to pick from just one on that list, go with the Pure Balance. Generally yes, Ol Roy is not a good brand, but the ingredients actually include real meat. I believe you want to wait to feed adult food until the dog is at least one year of age. You may be okay since she's a month off, but maybe start off with puppy food (if they have a different food for puppies) but the switch to the adult.
Keep in mind with better brands like kouneli suggested that the sticker price can be a shock, but you don't have to feed near as much of those brands as you would crappier brands like Iams and Science diet, thus you wouldn't be buying food as much. It's up to you, of course. :)