It didn't work for me either. We did a lot of work on bite inhibition, and even at his age he gets nippy when he gets all worked up. Actually, now it's pinching. Right between the front teeth he pinches clothing and those little pinches really hurt!
Anyway, do you have carpet at all? You could make a little flirt pole (The Flirt Pole: Dog Toy or Life Changer? | notes from a dog walker
). I love
my flirt pole. We have a big one that we play outside with because we only have hard flooring in our home. Carpet's easier on the puppy joints.
Teach leave it/stay until he has it down pat. Those require a lot of self-control.
Teach rollover, spin in circle, or weave my legs. Those require him to listen, think, and move.
Teach touch. Start with touch my hand, go to touch your toy, go to touch what I tell you to touch.
Teach him which toys are what. Line up two and tell him "get raccoon" and when he gets the right one you play play play for 3 minutes (whilst talking about "raccoon"). Soon "raccoon" starts to hide to make it harder.
Teach him to limbo/crawl under sticks. Tires him out physically.
Teach him to fetch and bring it to you.
Go buy a kong wobbler and put his dinner in it.
Buy toys that are long and thin that he can run around with. Murphy loves those and they definitely tire him out.
Those are the best I have right now. Murphy honestly has more energy than any other dog I've ever owned or even seen. In my opinion, teaching a skill and playing with the flirt stick tire him out better than anything else.