Can dogs count?

It would seem that Wolfey can count. Tonight I started the "couch to 5k" app. We only walked one lap (about a half mile) farther than normal but with the jogging added in it really wore me out. Wolfey must have been working harder too, because after the fourth lap (when we would normally quit), Wolfey headed for the car. When I told him we weren't done yet he came running right along, but he definitely didn't have the pep in his step he'd had before. It's so funny to me that he seemed to know the normal quitting time. I'm so lucky to have such a smart boy! Lazy, but smart ;)