A proper Chessie has a bright and happy disposition combined with courage, intelligence, a strong work ethic, and an alert nature that makes him an excellent watchdog. He’s strongminded, though — read: stubborn — and requires firm, consistent training by all the adults in the household. You can’t let him do something “just this once,” or you’ll spend days or weeks retraining him. If you’re providing the right leadership, a sharp look or verbal reprimand is enough to rein in bad behavior; more severe punishment is overkill and will only cause him to become sulky and unresponsive.