Here are some tips on running with your dog to make sure your dog is also in good enough shape to enjoy running with you.
I thought this was interesting because it took me a long time to figure out that my dachshund did not like going on long walks, and certainly wouldn't enjoy a jog. It's a good thing to remember that some dogs aren't made for high activity.
One good piece of advice is that a tail that's not wagging means your dog is probably not enjoying a run. Kody does more than not wag his tail, he actively tries to go back inside!