According to Dream Dictionary: An A to Z Guide To Understanding Your Unconsciousness Mind. ~ Written by Tony Crisp
Dragons are associated with our fears, urges, and sexuality associated with the irrational forces of the unconscious mind that we must conquer in order to find the potential locked away in our sexual, mental, and emotional energy.
The dragon, in turn, represents are need to overcome these fears or come to grips with them.
I know this wasn't exactly what you were asking for, but I hope it was at least a little helpful to you.