I am throwing yet another fairly specific question out into the forum for everyone to chew on for a bit. I recently read Bill Tarrant's book that highlights the Delmar Smith Method of training a gun dog. I am confused not only from this book, but from just about every other dog training book I have read (approaching 15 different titles now) on the issue of having your dog off leash, and in control. My little pup (almost 6 months old) is very responsive to "Come" when on the check cord. In fact she will come 100% of the time if the check cord is being used. However, if I am out on a walk in the woods with her off leash and having a great time just running around being a puppy, I can no longer get her to respond to "Come." My suspicion is that she knows all to well what that check cord means and when she doesn't really have to listen. I imagine many dog owners have experienced this same problem before.
So, the advice I am looking for here is how one goes about transitioning into "Must Come" ---where the dog will come when off leash 100% of the time.
Right now I am using treats and lots of praise to reward her every time she comes to me, on leash or off. However, like I said before, when she is off running around and playing my rewards and praise (from Come work) don't seem to enter her mind.
Thanks in advance to everyone who responds,