Obviously they don't exist any more, and seem to be purely mythical, but at the same time we do have proof that dinosaurs existed.
And there is still some dragon looking lizards left if I'm not mistaken, but they certainly don't fly nor breathe out fire!
Therefore I think it's possible that at one point perhaps some sort of dragon like creature might have existed, or perhaps a dinosaur corpse that looked like a dragon was found and it inspired the whole dragon movement.
As for a dragon in modern day society, I highly doubt it but there might be a miniature version of something similar somewhere in the world that has not yet been discovered, that could be possible, but I doubt the fire part.
And there is still some dragon looking lizards left if I'm not mistaken, but they certainly don't fly nor breathe out fire!
Therefore I think it's possible that at one point perhaps some sort of dragon like creature might have existed, or perhaps a dinosaur corpse that looked like a dragon was found and it inspired the whole dragon movement.
As for a dragon in modern day society, I highly doubt it but there might be a miniature version of something similar somewhere in the world that has not yet been discovered, that could be possible, but I doubt the fire part.