Penny has tons of energy and loves to run. Her mommy (me!) could use some exercise, too. Unfortunately, it's been hard to go running or jogging with her. She'll either stop suddenly to sniff something, or worse, when we're going at a great, matching pace, she gets really excited and starts sprinting as fast as she can (which is VERY VERY fast) and ends up dragging me for a bit until I get her to stop. Any tips? Thanks!