Looks like a Great Pyranees to me.
My neighbor had one. Short haired male. Dog was muscled up like a pit and as big as a mastiff. An certifiable crazy as hell. He had a look in his eye that always made you feel like a ribeye.
And as bad as that dog was, he had to find him a home, the mules nearly killed him whenever he let them get close enough. Dog had to sleep with one eye open.
