I think I have a phobia of all dogs that meet these requirements:
a) a reputation for being vicious.
b) a medium sized or large dog.
c) generally a dog that can run.
It's funny because the only indecent that I can remember is when the next-door neighbors had a dog that is really excited ALL the time. If he sees someone or some thing (This is how he killed a pet rabbit and a pet chicken) he runs up to that someone or something and starts "playing" with that person/animal and that usually leads him to biting you, though not very hard, once or twice but one time he bit too hard or my arm and now there is a hole in the jumper was wearing that day...