Fire and Amulet — Helen B. Henderson

Trelleir is a true dragon whose magic allows him to take on human form. The last of his kind, he longs for companionship. However, his only friend is not only a human female, but a slayer. Sworn to kill all dragons, including him. Summoned by the village council, Deneas is sent on.a quest to kill any and all dragons, and cannot return without proof of her success. Finding the mythical creature and avoiding its deadly talons and fire are not her only problems. Another slayer follows with orders to kill her. As she retraces her slain mother's footsteps, she learns the world is not what it seems.