What if??

[Nerindel]

Hmm off course, good point Farael. So that leads me back to the thought that Morgoth possibly could have twisted and corrupted the dragon's already given life by Eru, like Lalwendë Suggested.

It could be that the dragons were corrupted by Morgoth, as their origins are unknown beyond that they emerged from Angband. They could have been extant creatures, corrupted to his needs, but we do know that Morgoth 'bred' dragons. Smaug is said to have been the greatest of his kind so he could have been one of those bred by Morgoth or a descendant of them.