See Jack Run

My Jack won't run with me more than a few short blocks. I just returned from a typical walk with Domino my Jack Russell Terrier. Our walk usually lasts about thirty five minutes. Domino is from a high energy breed. But on most walks after hitting the half way point, as I begin to jog it's like I'm pulling a lump. He makes it clear that he's done jogging. What's the deal here? He is only two years old and it's like he's the old man. Domino is our first family dog so he is spoiled rotten. He had great training and follows his commands very well. He is a perfect dog for our family except for jogging which seems to be lost on him. It's not like I'm running at top speeds unless the Exlax is working. Most of all it has become really annoying since I've seen Domino run on his own and he is so fast. Feel free to chime in with any tips you can offer and tell me your dog story.