Thank you for the replies. I have already figured out that the retractable leash is not a running leash. He has even acted as if he needed to make a deposit in order to stop. I knew he wasn't tired because we had just started the running for the day. I do tell him that we are "going to pick up the pace", so maybe I need to put it simpler for him. He does seem to like the pace that we go at (I am just starting to run, so I am very slow). Maybe he just needs more time. I won't give up on him yet (he wouldn't let me, he likes it to much).
Thank you
Tammy