What Brand Dog Food do you Feed Your Dog and Why?

I fed Nature's Recipe Chicken/Barley for many years. Dogs did well on it. When they came out with their grainfree chicken/sweet potato/pumpkin formula I had a hefty coupon and tried a bag. They all did very well on that, too. Went through a financial tight period and went back to a bag of the chicken/barley formula to save a few bucks. The one ****er spaniel had a chronic lip fold infection, and it had cleared up. I never made the connection until we went back to the barley formula and the lip fold got funky again. She's been on the grain free ever since with no problems. Our dogs on this lived good long lives, and had good bloodwork at really senior ages.