He is two years old and has only been to two classes? Or did you mean he completed the entire course twice? He needs a job and lots of exercise. The biting the shoes when you leave is not as cute when he is two as it was when he was 12 weeks old is it? I would institute NILIF right away and continue the obedience classes. Maybe look into Rally if you want a fun obedience sport, or agility (which takes a bit more equipment to practice). Anything active where the dog looks to you for direction in order to keep doing the fun stuff is good. Some dogs, like mine, would rather work than play with a ball. She will work for a good half hour with her tail wagging but will only chase the ball a few times before losing interest. On walks she is always happy to be out. Any exercise that includes you and/or your wife with your dog is good.
Snake Vom Eselspfad RN CGC (AKA Raina) 3/5/08
Pyrate CGC 4/1/03-5/16/12 RIP
Too many to list waiting at the bridge but remembering them all