How old was your dog when you start taking them on runs? Were they well behaved right away? Did they pull on the leash?

Right now our dog is 8 months old, he's a chocolate lab mix with a ton of energy. He's not a very good leash walker, he pulls a ton! When I bring him on runs, he is normally ok while running, but once I slow down and walk for a bit, he darts off and pulls as hard as he can. Also if there are other people around or dogs, oh boy....