My dog was a seasoned puller, at only 17kg he could pull me over if i wasn't paying attention, and he was very exciteable. He would pull and lunge towards other dogs and people (not aggressively, that's another subject). Using this book as a guide, I went back to basics and started from scratch, withing 4-6months we have stopped most of the pulling, he no longer lunges, and will only pull on the short walk from house to field, if I turn in another direction he walks perfectly to heel. We are even making progress on the short field walk, and most days he only pulls for the 1st 5 meters, then understands that i won't allow it. The method is kind and friendly with no nasty squirts of water, shocks, sprays, or aggressive checking that are recommended in other training manuals. Definately worth getting, and if these methods are used from puppyhood, there should not be any pulling at all.