I suppose it depends on the book. There are different kinds of dragons, from different worlds, and some who are native. There's one that talks here on the network sometimes.
Ah, alright. Suffice to say, we don't really know. They called themselves gods and went by the names of those people in my world still think of as such. There are just hints and whatnot, that they were something else entirely. If one shows up, I'll introduce you and you can ask them yourself.