This waste of space is lucky the Great Dane hid instead of taking him apart. I once saw a trained Irish Wolfhound (about the same size as a Great Dane) kill an untrained pitbull whose owner was threatening a friend of mine. Took about 2 seconds.
This fool is lucky if he just ends up in jail.
PS I’m allergic to dog dander, too. But you suck it up. Have helped raise two wolves. They’d have just killed this puke if he hit me. Had to call one off when someone just threatened me - but she was well trained and obeyed. If contact would have happened? Doubt she’d have backed down. (She was mad at me for several weeks for calling her off.)
Wolfhound is the biggest tallest dog there is.