Is there such a thing as too many books about dragons? I think not. Here are some others I enjoyed.
The Dragon Trilogy by Jessica Day George is about a girl named Creel. In desperation for money, her aunt decides to leave her for the local dragon in hopes that a knight will rescue her, marry her, and solve their problems. Creel has other ideas, and the first book is about her friendship with Shardas, a dragon, and how they (with the help of a cute prince and the other dragons) put an end to a war. The second two books continue with the fantastic adventures. I highly recommend them.
Another standalone book is A Tale of Two Castles by Gail Carlson Levine. Elodie travels far from her family to find a trade in the city, but ends up being apprenticed to a dragon.
One thing I found so amusing about all these books is that there are things about dragons that "everyone" knows, but they're different for each book or series.
I hope you enjoy!
Love and Fire,