As with any food source in nature, it is still there because either it is not desirable at all, there is a plenitude of other food in the immediate area, it has not been found yet or there is something keeping hungry animals away. Hard to believe that a hog carcass would not be desirable to scavengers such as buzzards, crows and coyotes. Also hard to believe that even without a overwhelming stench, it has not yet been found. The Vultures are there, but seem quite disinterested even tho there is a comparable banquet there for them.
I kinda figured the trespassing dog would have have least been back to roll in it.....