Our boy is 3 now, and has finally settled down, but does need a good amount of exercise or stimulation. If you can find some neighborhood dogs to play with, that's a great way to wear your pup out and gives him socialization. Our guy doesn't care for balls or fetch. Mental challenges are tiring. Our favorite is some treats in a bag inside a box inside another box inside.... you get the drift. I save cereal (and similar) boxes, paper bags, amazon boxes. Marchie works and works to get at the treats, trying to figure out how to get at it. You can put treats in more than one of the containers, and I sometimes poke holes in the boxes so he can smell the treats. Also, chewing seems to be tiring, so marrow bones or other long lasting chews (jumbo bully sticks) work. But, all in all, we still walk our boy a total of about 1.75 hours a day. On the other hand, it really keeps you fit to keep up with a young dog.