The worst exp I had yet was while struggling up a steep hill, this Austrailian Shepard/mutt came at me. I was only able to move at about 1 or 3 mph and that bastread was just going berserk, charging at me and then backing off as I kept pedaling towards him. Since I was standing up on the pedals, I think he was a bit intimidated.

After a few seconds he figured it out and started to go at me from behind. That really sucked. I thought for sure that the POS would nail me. I felt a tug on the bike as the fool began chomping on my rear wheel. Just then, as luck would have it, a car came up from behind, and Fido headed back to his yard.

BTW: The thing was clever and kept its distance. There was no way I'd have been able to whack it with a pump or anything. A nice handgun would have worked though