My dog takes pretty much everything as a game... Clicker training is a great game, he starts bouncing in excitement when I get the clicker out. We don't always do anything "real", just shape whatever. Its a great game to play when tired- you can just sit in a chair and wait for the dog to work out what will get a click!

Retrieving is a favorite "game" too.

Running around aimlessly is fun too. I run, he chases me. I turn, he turns and catches up, I turn again, and so on.

The kicking game is fun! I kick (gentley, of course) at him, he bounces and tries to figure out how to get close enough to leap up and lick my face.

"Go find" is excellent, its both fun and makes them think. Put the dog in a sit/stay, show a toy, then hide it. Tell the dog to find it, and it has to find that specific toy.

And theres lots more games Web and I like to play too...