Hello and welcome to the PR! Welcome to Cabernet too. Lovely name!

I think as Roland said, most sps are full of energy till they grow up. I was only just thinking the other day that I dont remember when Montana stopped pacing around the living room, playing with toys, looking for toys, standing in front of the tv, putting toys in your lap, using your still leg as a buttering ram to bounce the toy off as you watch tv, etc etc. It seems she's gone quiet(er) and I didnt even realise it was happening! LOL
Good luck. I'm sure he'll grow out of it. Walks and training, learning tricks and having a 'job' to do help.