Teaching your dog to walk on a loose leash stops him from pulling during walks. It is not a perfect "heel" which keeps your dog strictly by your side. It allows your dog room to sniff and explore the neighborhood, as long as he leaves some slack in his leash. In other words, your dog won't be pulling your arm out of its socket as he lunges forward to get to where he wants to go. Instead, he will have to follow your lead in order to be allowed the freedom to see the sights.