Looks like a Münsterlander. That's what we think our big guy is, or a mix of, anyway.
And yeah, I could see that idiot being molested by a deer. He's constantly picked on by his sister who's half his size and takes it all in stride if he's focused on something else. She could stand on his back and if he was Iocked in, watching something in the distance, he'd pretend she wasn't even up there.
They're bred for hunting birds and smaller game. If it's small he's locked in, or he's bolting after it. I've clocked him at over 25 MPH, and he's somewhere between 85 and 90 lbs. Rabbits hood a particular fascination for him, but he hasn't caught one yet. He's scared a number of them into the next county, though.