I looted the dragon and went back to where I had first ran into him. I took him out with ease and waited for my human form to return. I got a few hits on the dragon and ran off along the river. right in front of three guards and a stable boy. So when a dragon spawned just outside Windhelm (at the stables beside the carriage), I turned. I thought it would be cool to see how a werewolf and a dragon would matchup in combat (and also because i was overincumbered).
