I had a dead deer, a fairly large doe, right in front of my driveway last summer. It wasnt there when I had left a couple hours earlier, so it was fresh. The county wouldnt come and get it, so I picked it up and put it in the bucket of my tractor, and hauled it up the hill into the woods a few hundred feet.
Bad idea.
The next day the smell was horrendous, there was nowhere on the property to escape it. Nowhere. I went back there and it was completely coated with thousands of flies, it was absolutely vile.
Next day, same thing, but even more flies and now maggots, but a lot of the tissue was gone and some exposed bone.
Day three, same thing but lots less tissue, mostly bone.
Day four, the smell was mostly gone. I went up there, and there was nothing left other than a 99% bald skeleton and a lot of hair and a few random flies.
Day five, no smell, a few piles of hair, a couple of flies here and there, and a few scattered bones. Almost everything was gone.
Next time, I'm building a big fire. I have way more wood than necessary to cremate a deer of any size.