Like pigs? I had no idea. Why then do we feed them meat all the time?
When it comes to feeding dogs, even though a meat may be the number one ingredient it is quite likely that they are fed more grains than meat. For example this is a copy and paste of the ingredients in a popular US dog food:
Chicken (Source of Glucosamine), Rice Flour, Corn Gluten Meal, Whole Grain Corn, Chicken By-Product Meal (Source of Glucosamine), Whole Grain Wheat, Soybean Meal, Beef Fat Naturally Preserved with Mixed-Tocopherols, Glycerin, Liver Flavor, Calcium Carbonate, Mono and Dicalcium Phosphate, Salt, Caramel Color, Dried Carrots, Dried Peas, Potassium Chloride, Vitamins [Vitamin E Supplement, Niacin (Vitamin B-3), Vitamin A Supplement, Calcium Pantothenate (Vitamin B-5), Thiamine Mononitrate (Vitamin B-1), Vitamin B-12 Supplement, Riboflavin Supplement (Vitamin B-2), Pyridoxine Hydrochloride (Vitamin B-6), Folic Acid (Vitamin B-9), Menadione Sodium Bisulfite Complex (Vitamin K), Vitamin D-3 Supplement, Biotin (Vitamin B-7)], Minerals [Zinc Sulfate, Ferrous Sulfate, Manganese Sulfate, Copper Sulfate, Calcium Iodate, Sodium Selenite], Choline Chloride, L-Lysine Monohydrochloride, Sulfur. X-4154.