I bought this harness for my parents' 18 month old German Shepherd. My mom was not able to walk him due to his strength. We couldn't slow him down with a prong collar, nylon training collar, or choke collar. This is the only thing that works for him. We can walk him along side my puppy shepherd. The shipping was fast and the quality of the harness is great. Once my puppy is full grown I will be buy a harness for him!