Chicken, lamb and fish are the most typical proteins within the pet foods being studied. What many of these sick pets had in widespread was that about 90% of them had been fed grain-free diets, and about 93% of the diets contained peas and/or lentils. Dogs presenting with these signs, whether or not or not they’ve been eating grain-free diets, needs to be examined by a veterinarian as quickly as potential. Why Grain-Free Pet Food?