My puggle has always been a hardcore puller when on walks. We previously had a back-clasping harness, and his leash would be wound so tight it would leave red marks on my hands. A dog trainer recommended this harness and I can not believe the difference. I never thought I'd say this, but he walks at a leisurely pace beside me now, even with some decent slack on the leash. As soon as he starts to veer off the course, I just give a gentle tug and he's right back with me. I highly recommend this harness, we are very happy with it!