The dog whisperer sometimes has dogs use a treadmill to get used to it (I know, not everyone has a treadmill...) He suggested that having them go on a treadmill and keeping a favorite treat/toy in front of them could help. Also, when walked your dog he also suggests to not have a tight grip on the leash, they somehow feel the tension/negative energy through the leash . . . . . . I'm going to try the treadmill thing with my 12 wk pup soon.....because he's a mess on a leash as well