Like human foods, not all dog foods are considered healthy. There’s a huge chance that the cheap food you’ve been feeding to your dog isn’t healthy because most pet food manufacturers include junk and filler products.   If you want to give your dog a healthy diet, consider feeding them dog food (or even human food) that is non-whole grain and rich in protein.   Some proteins will satisfy your dog’s hunger, but an excellent protein will fill your dog up with energy for their brain and muscles.