It sure looks like a mink to me.. weasels are smaller and white this time of year, a fisher is a LOT bigger, wrong shaped head for an otter, and of course that is not a badger or a pine martin.

Those little mink like that will really do damage on a farm. We normally had weasels as there was no water near us. I have weasels around here, but since they do not bother me and eat the mice that like to infest my garage, I leave them alone and just sweep up the bones they leave.