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Dogs will re-eat dog food thats gone thru their system to derive any left over undigested nutrition from it they can.
Contrary to most peoples thought processes all the usable nutritional
protein ect isn't completely digested as its only like 60% efficient.
This is a survival tactic... but i've seen my dogs eat very dry coyote poop that was many months old as we sat on a rock.
Dogs need a bone to chew
so we buy the pre baked rib bones which leave no oder or stains at the pet food store (pricey but worth it)
and this acts as a pacifier !
but generally a dog will bury that same bone under the blanket rather than chew on it in the cage.
They slowly get that marrow out of the center which is like BEEF jerky to us.
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