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Most of the replies to the OP are vanishing up their own bums imho. If the science of a novel needs to be based on fact, please explain to me the last episode of Dr Who I watched: screwdrivers which could open anything; fish which floated on fog; cryogenically frozen people in a Victorian setting; etc not, of course, forgetting that the Tardis is bigger inside.
This is just a small example of how vast the imagination is. You can do anything you want with fiction, even have a world 4 times as big as earth behaving any way the author wants it to. Let water flow upstream, I find the idea rather fun, or maybe the leading species are horses as in one part of Gulliver, or Apes, as in Planet of the. Or cats, as in any world I'd love to live in. Maybe everyone speaks in a variety of meows and different types of purrs. Humans would be their slaves, farming and providing them food. etc etc
In a novel you can make anything do and be anything, unless you're writing a gritty fact-based book about someone dealing with cancer, or nuclear catastrophe. In situations like this, facts based on real-world reality are important. But this isn't what the OP seems to be writing.
A world with gold-greedy dragons sounds exactly the type of fantasy where anything can be what you want it to be just because that's where imagination takes you.
There are too many po-faced non-rules about writing which inhibit freedom to be original imho.
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