Ax,
I get the feeling that flypiper just drops in about once a week to chat about dogs. She was the one who made the "Tear Jerker" video about rescued dogs that I posted earlier. I'm betting that she'll be back but you may need to wait another week.
There are some harnesses that work quite well at getting a dog to walk properly, but they did not work on Maxi. I've finally got her to the point where she won't leave the yard even when I'm not watching and walking without pulling but it was hard work.
I'll let the professional respond before I give out any ideas.