Cannot lah, if dogs know nutrition and can select food for their nourishment they are more intelligent that human liao! I have my doubt on this theory.
Also hard to swallow is the opinion that poop eating dog is not getting the nutrients he needs.

I think the hint is in Kitsilano's post. It's more to do with the added chemicals - preservatives, colouring in commercially pack food.

Now ponder on all the reported benefits of a BARF diet.

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