People often confuse a "raw diet" with an "all meat diet", based on the assumption that a dog's natural raw diet is also a meat only diet. The truth is that dogs cannot survive on a diet of meat alone. They are omnivores and meat should form only a part of their over-all diet, whether raw, processed or cooked.
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In the wild, canides eat not only the meat but also the bones (rich in calcium), the organs, and the stomach and intestines (with their contents) of their preys. The stomach and intestines' content are mostly composed of vegetable material, as the wild dogs' kills consist almost entirely of herbivores (plant eating animals).