Could be a coydog. Maybe a female yote bred by a fairly large dog. Have to have a better picture to tell for "sure". I've seen a few of those coywolves through the spotting scope well out of my range with what I was carrying at the time. 500 yards and a .444MAR isn't a likely combination. Not from me anyway. PA has some pretty dang big yotes up in the Poc areas. Not uncommon at all to nail a 50 pound yote around there. Nailed a couple nearing 60 pounds.