I'm struggling with this issue, too. Things finally reached a head this weekend when Bo pulled me (as she was charging towards two dogs she didn't know) and I fell down hard and seriously bruised my hip. I was EMBARASSED to say the least, as I fell down in front of the dogs' owners, plus he's my huge, well trained dog acting like a complete @ss. I have her on the gentle leader harness, which isn't working becuase it doesn't give any kid of correction that she cares about. I used a gentle leader halter on her, but people were frightened of her & she picked up on that fear and began to react to it. I'm considering a prong collar becuase I don't know of anything else that will get her attention. I guess it's come to the point that i have to admit that my 130lb dog is stronger than me (at 130 lbs, myself) and that I have GOT to find a way to keep her under control.
Jenn