We feed Nutro as well- discovered it years ago when we had a dog with crazy skin issues, and it was the only food that made it difference (we tried about 10). Our current dogs eat it too, and it is widely available (Petsmart, etc.) Your are right about the stool- my dogs poo looks like it came out of dogs half their size!
BR- what are you feeding Pepper now? I think sometimes we get too caught up in variety and the notion that dogs get "bored" with their food- which is assigning a human trait onto an animal, and sets yourself up for unnecessary guilt. I love animals, but heck, sometimes people go a little crazy in their assumptions of what their pets "need". Do they really need a home cooked gourmet meal? No. Do they need to eat something different every day? No. Do they need a $500 designer dog bed? No. Do they need fancy clothes? No. Do they need fattening and unhealthy treats, or even worse, people food? No. Marketing has hit the pet care industry and hit it hard.
What pets DO need- decent quality food (and making yourself nuts over this and spending most of your life providing it is over and above), clean water, a clean and safe environment, good health care from a vet, exercise, and love from their people.