If you run with your dog, or just have a dog that drives you crazy, this is an amazing product! I can now just hook our hound-mix up and barely even notice that he's there when I'm running. The leash quickly detaches from the belt, if the dog needs to go potty. Also, to keep him out of trouble when we're home, I just attach him to me with the extension, and he has to follow me wherever I go!