This harness, leash, and seatbelt combo is a great deal and made well too! We prefer harnesses because we do not believe in pulling on a dogs neck. When we got ours in, we applied it to our most stubborn dog and promptly took her for a walk. It fit nicely and can be adapted to a specific dogs size easily. She was not happy at first, it gives the walker a lot more control than the one we owned previously. Needless to say, it did fit her perfectly, and after a few days, she got used to it. Now she looks forward to her daily walks and we do too!