WHY!!! Do dogs enjoy rolling in/over/on DEAD animals?

My wife says dogs have cleaner mouths than humans. True as far as germs but I won't kiss one. Don't have to hide the cats litter box from humans to keep them from eating it.
 
They roll in dead things to show the other pack members that they have "made a kill". The stink elevates their status/rank in the pack.

Their mouths aren't really cleaner than ours. They have less of a variety of bacteria than we do in our mouths. Not less bacteria.
 

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