Spencer
Could be a wolf hybrid. For awhile they were quite popular, and there are still a lot of them running around. The biggest Hydbrids I've seen are about the size of a large shepard. As far as wild Wolves (I believe the grey wolf was native), there have't been any known in the Southern Peninsula in close to a hundred years, and the only reason they're in the UP is because the DNR has a breeding and protection program going on. So, relax. The odds are pretty long that this is a wild wolf, and if it is, that might actually be better than somebody's half wild dog.
SHF