Skinning a deer, moose, elk or buffalo etc is very very hard work and very precise. I "cape" deer, elk and game like for folks who want to mount them. I have been doing it for years and its very tedious work to get the skin off without cutting it, especially around the eyes, nose and bones of the face. Its not something that the average person is going to do for fun.
I suspect if this is truly a horse, then it probably fell off a rendering truck. I still wonder if its not an elk or moose, if you have not seen what one looks like skinned, minus the ears nose and just the eyes, it is very deceiving.
And yes, a skinned bear foot looks like a human foot. Many people report finding a human foot and it ends up being a bear foot that some dog has drug home after the owners skinned it out.