I had a dog for 16 years . When she was 14, she developed some health conditions. I learned that commercial dog food may legally contain “4-D” meat: meat from dead, dying, diseased and disabled animals. Many contain corn contaminated with high levels of pesticide. Starches and fillers are other common ingredients, along with artificial colors and preservatives, plus synthetic vitamins and minerals that may not nourish your dog effectively. I was able to reverse some of her skin conditions and other health issues by changing her diet to a whole food, plant based diet.