That's exactly how we had to teach our puppy, and we go to one of the best dog schools in Germany. We first had our dog to learn the sit and down command before going to the come command. It works great with a leash. I also use the leash out in the forrest although there I won't keep the 10 meter leash in my hands. But when I call her there and she won't come, I can quickly grap the leash and pull to get her attention.