Tucker the spinning dog

That's hilarious!

Obviously it's some kind of game to him.

I had a border collie that spun like that when she was excited. Also insisted on carrying rocks, so much so her teeth were rounded and dull. She'd carry boulders into the house and pile them behind my easychair.
I'd toss a stick into the lake for her to fetch and the crazy mutt would swim to the stick, dive down and sure enough swim back with a boulder in her mouth she hauled off the bottom.