My dog, a border collie mix, is sometimes too smart for her own good. In all the cleaning and packing we found a misplaced tennis ball.

Zoe has been known to play fetch with herself if I'm not paying enough attention. This morning she started her little game and then stared at the ball as if it were defective because it didn't roll far enough away. And then she barked at it.

I finally tossed the ball a few times, but instead of bringing it back for a proper game of fetch, she "tossed" it herself -- and repeated the staring and barking.

I don't suppose anyone's made a self-propelling ball for dogs yet?