"Karen [Pryor] can teach anyone to train animals with a cheap, plastic, handheld clicker, rewarding wanted behaviors--click!--and ignoring the unwanted. No leash-jerking. No pushing. No smacking. Animals quickly learn that one behavior gets them a reinforcing click and a bit of food, and undesirable behaviors get them, well, nothing at all. Given the choice, animals quickly focus on what works and abandon what doesn't."