[alaskayorkie]

It's good that you're using a harness. He won't hurt himself. Try stopping (gently) and changing directions when he pulls. If he pulls the other way, change directions again. Don't ever let him tell you which way the walk is going to go. When he does good, reward him.

Another, better, solution is to teach him to heel and pay attention to you. Hold a treat in your hand between your eye and his and tell him to heel. If he stays by your side for a few seconds and looks at you or the treat, say good dog and reward with the treat. Gradually, increase the time before the treat.

Of course, that's easier said than done. I've had Eddie through a bunch of obedience courses, and he still pulls when something excites him.

Jack, on the other hand, doesn't even need a leash. He never leaves my side.

Good luck.