i have just read your thing again and didnt take notice of the being good without dogs there but running after dogs and not listening.

Now.. this will make you look barmy, but i dont get embarrased doing it haha..

When your dog runs after another dog and wont leave it alone.. i will use a whistle and then run away as if you have just spotted like a tornado in the distance or something!! haha run away and whistle in the opposite direction to where he is and he will be like OMFG WHAT A GREAT GAME and they will run after you.

This makes walks exiting for them as they learn that you can do fun spontanious things.. and he will pay more attention to you than other dogs