My puppy and I ran 3 miles this morning. He was so tired afterward, he wouldn't even stand up for his water. He just plumped himself on the floor by the impromptu water dish (he was too tired to run downstairs to his regular water dish).
Poor guy. I hope I am not working him too hard. He always gets excited about these runs, and he is the one running ahead of me all the time. The vet said exercise would be good for him (he packed on a few pounds in the past year).
And here is a video of my puppy. Note his heavy panting. And keep in mind - if a rambunctious pup is this tired, just imagine his owner right now. :)