I have been using harnesses with my puppy (because I was so nervous about him slipping out of collars), but he started to pull a lot and we felt like we had no control. Our dog trainer recommended a slip lead, and I order this one and I'm obsessed! I love the safety stopper as an added protection that he won't back out (truly my biggest fear!) and it makes our walks so much more pleasant because he's more responsive to pressure on the leash and I think he's much more comfortable without a harness too! Highly recommend! It's also comfortable to hold and the blue color is really pretty.