Biologically Appropriate Raw Food, or Bones and Raw Food (BARF), including PREY, means fooding your dog or cat natural, unadulterated raw and real food that is absolutely suited to his or her biology. Food is deemed biologically appropriate if it is the food an animal has evolved to eat, and the concept applies to birds, dogs, cats, rabbits, horses, fish and huumans. Real food provides the most optimum nutrition for your pets. If you are looking for the best food to provide to your cats and dogs, you should consider real food.