I use a short lead, under the chin, so I can hold their head up, if they pull, they get tugged back and chocked (not literally!!!!!), and when I am walking I constantly do sudden direction changes. I also sometimes cut a very thin piece of hazel and as they start to pull, put it in front of their nose, as an obstruction. Should stop pulling in a day or two, and a couple of weeks later walk to heal off the lead.