[yorkietalkjilly]

He's too excited. Practice putting his walking apparatus on him frequently all day long and so often that he just takes it in stride. Leash him up, get your keys, walk to the door and then come back to the couch, remove them, give him a nice treat once he's calm. Leash him up, get keys, go to door and even outside it but come right back in and remove all, treating once he relaxes his body, is quiet. Going over and over that aspect of it can take all of the intense amp-up out of it and inure him to getting past the intensity of the early part of his walk. And it shows him that a calm, relaxed state gets him a nice treat.

Reward him with a walk only once he's relatively calm once he outside. Just peacefully, calmly stand outside on the porch and hum to yourself if necessary until he settles down no matter how long this takes, then give him a little treat and step off the porch and begin your brisk walk. A slow walk now is wrong here and boring to a dog that tends to excitement. I'd walk fast at first to help work out his excitement and tension and then you can slow down later if you'd like. Later, once he's walking better, you can teach him how to begin by slow-walking but at first, go on and let him walk fast if he's still a bit amped to walk. If he begins to jump around or pull, just stop in place and stand there peacefully/calmly until the leash goes slack and then begin walking again until the leash tenses. Tension in the leash means pulling so stop, wait for a loose leash, then forward. Once he's back home, a visit outside and then a treat once he's quiet and calm again.