We rescued a bull arab cross who has come a long way but the one thing that never got better was his pulling. We've tried paid trainers, all different collars, non-stop training with every treat or system you could think of but nothing worked, he just wanted to smell and look at everything on walks and would drag us behind him. I was sceptical when I bought this, thinking it would just be another thing that doesn't work but give it a go because we're desperate. Oh my god!! I wish we found this 2 years ago. This instantly stopped his pulling. Walks are now so much more enjoyable, he looks more relaxed because we're not tense. It took him a walk or 2 to get use to it but he easily adjusted. We're now buying one for our second big dog (who is no where near as bad) so anyone can take them for walks when pet sitting and because it literally stopped all pulling!!!