When you walk him is there any running, chasing balls, or jumping jumps along the way. By jumps I mean fallen logs etc. He needs some excitement to wear him out I think. At that young age lots of energy is needed to match his. You might consider setting up some short jumps - 16 inches at the most. It uses up a lot of energy to do the jumps right. I also set up cones for weaving and other interesting things like a tunnel to run through. I also run laps around the back yard stopping and turning suddenly with Raina heeling at my side. She loves that part, especially the part where I turn suddenly and switch directions. We both get a work out so I get my cardio and she gets her excitement.
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