before you head out on your exercise walks. start in a quiet environment where your dog will not be tempted by great smells or other distractions. teach your dog where you would like him to be by stepping out ahead of your dog and encouraging him to follow. as your dog catches up, click and treat when his shoulder is in line with your leg. then, while he is focused on the treat, quickly step off again and repeat. once your dog gets the idea, add in a few steps before you click and treat.
expect that your dog will have a harder time once you start to walk together away 