I once had an Aussie foster pup, 7 - 8 weeks old and straight from the pound. I taught her the basics with the clicker in two days, so several behaviors spread out throughout the day. She had the down stay mastered in ten minutes.
One time I was calling her and calling her and couldn't see her. There she was, sitting at my feet, looking up to me; she was already there.
WD is not that way; he has an agenda of his own, which I love by the way. He would never be a slave.
With him I could never gotten him where he is today with just the clicker. He also needed to be reprimanded in his sharky stage.