A food with only 21% protein wouldn’t be quality. That’s way too low, hardly enough to survive on! Unless your dog has liver disease or is in late state kidney failure I wouldn’t recommend feeding a food with any less than 30% protein. Most of the 5 star grain-free foods will fit the bill. All three of my dogs eat 45% – 55% protein – they range from 7 months old to 7 years old and are all extremely healthy.
Check out Dr. Becker’s articles on picking a quality food – the #1 think to look for is HIGH levels of HIGH QUALITY protein!
http://healthypets.mercola.com/sites/healthypets/archive/2010/10/21/selecting-the-best-cat-pet-and-dog-pet-food.aspx
