I've seen many instances of people who see a big dog and are afraid regardless fo what kind of dog and its temperment. I've seen people afraid of dogs that would only like them to death. I've also seen such dogs turn angry and protective, when you threatened someone they cared about, and I've had such a dog. You don't need a rottie, and even the one who is not a guard dog may protect you. Many are great alarms, because few things can sneak by them without them making noise.

If picking a bat, pick one that is light. It will allow you to swing faster.