A leash is not just a training tool. It can protect your dog from injuring himself as well as others. If you let him roam around the neighborhood without a leash, he could ingest toxins from the dumpster and bring home a host of health problems. He might dig through soil and trample flower beds on other people’s gardens. Or worse, he could attack someone or another dog if he is not restrained by a leash.
The first time you put a leash on your dog, he could get really excited. Stand still and wait for him to calm down. Tell him to sit and stay as you put on the collar.
Take one step forward, stop, give treat, one step again, stop again, reward again. As he gets used to stopping when you are still, you can increase the number of steps. If your dog pulls, stand still. Let him bounce around at the end of the leash but hold your position. He will eventually calm down when he realizes that you are not going anywhere. If you walk while your dog is pulling, he could interpret that as a reward for his behavior.