Steve
Mostly Harmless
I can tell you from personal experience that most people are viscerally afraid of my St. Bernard when she barks at the door, and she's a petit St. Bernard at only 120 lbs. I have a sign on the front door that discourages people from knocking or ringing the doorbell. It's not that I don't like talking to people. It's because I know they are unprepared.I actually don't have a fear of pitbulls, as long as there's only one. If I have a dog treat, I'll use it. If not, I've actually seen a pitbull whimper away after getting a soccer ball kick to the head. I don't know if that same effect will be duplicated every time, but this shows that it can be done.
My understanding is that an unarmed able-bodied grown man is more likely than not win against most breeds of dogs, even if he himself doesn't come out in one piece.
The only breed of dog I'd be likely to curl up in the fetal position from is the Doberman Pinscher, since they're the only dogs that were specifically bred to take down humans.
I should add that she's a sweetheart, and her demeanor changes completely once we invite people inside, but strangers don't know that.