Start out by placing a long two or three
meter leash on the puppy and face him, then command him to «Come»; right at the same time give one pull on the leash making the puppy to come to you.
To make sure the puppy dog has gotten the idea, place a thin rope (or something similar) of about ten
meters long
on the puppy and allow him to run off freely, without letting him see that you are holding onto the rope or
leash, you can make it less obvious by placing the
leash flat
on the ground so he does not notice.