I've been about 90% successful with mine for the last 6 months. Jack hated it in the beginning, wiggling his way out of it constantly. For us, it was a matter of lots of patience and persistence (as everything is with basenjis!) He still pulls out of it if he's startled or really distracted by something, but for the most part, he just deals with it. It has made our walks much more pleasant and frankly, much safer for him. I do have to say that when he's not in the GL, he still pulls, so he really hasn't learned NOT to pull, but he just doesn't do it with the GL. My biggest issue has been people always thinking its a muzzle – as if basenjis even remotely resemble vicious attack dogs - ha! Good luck!