The Urban Pantheist

I'll preface this by stating that I'm presently a omnivore, so really this is academic for me. If the B-12 only comes from animal sources, does it stand to reason that you would get a richer grade of B-12 from carnivorous animal poop, or would the unwashed vegetation result in similar amounts of B-12 regardless? I suppose all this means is that if you're avoiding animal products for ethical reasons, there's no reason you couldn't just chomp on a handful of fewmets or whatever for your B-12. Not that I'm encouraging that sort of behavior.
-Andy