thelioninmybed:

On the surface, this seems like a ridiculous proposition. It’s not. Even the slightest bit of thought will reveal a shocking amount of symbolism and numerous parallels inserted by Tolkien to draw the attentive reader to the obvious conclusion.

Why would Thingol, who loved human disaster Turin Turambar like he was his own son, so despise a proven warrior of noble lineage? Because he was a dragon.  Therefore Lúthien spoke, and said: ‘He is Beren son of Barahir, lord of Men, mighty foe of Morgoth, the tale of whose deeds is become a song even among the Elves.’ Note she introduces him as a lord of Men but not as a man. Because he is a dragon. 

Look at the Ring of Barahir – it is serpents, a term used to refer to dragons throughout the text. 

but Glaurung withheld his blast, and opened wide his serpent-eyes 

Urulóki Quenya word meaning ‘fire-serpent’, dragon. 

Despite his love of Finrod and his loyalty (the serpent that upholds), it is Beren that brings about his doom (the serpent that devours), just as Glaurung, Beren’s kin, will destroy the second king of Nargothrond. 

[N]one know how he found a way, and so came by
paths that no Man nor Elf else ever dared to tread to the
borders of Doriath.

No man or elf ever dared it…but a dragon did!

But though their kinds were revealed, Sauron could not discover their names or
their purposes. 

Why was he so confused when it was pretty frigging obvious who they were and what they were up to? Because Sauron, quite reasonably, did not expect to find Finrod Felagund keeping company with a dragon. 

Think about the much discussed Leap of Beren. Did he really jump fifty feet in the air or did he fly? (this would make him an early prototype of the winged variety of dragons)

Trying to take the extra silmaril seems foolish – a jewel in the hand is worth two in Morgoth’s crown – until you remember he is a dragon and of course he was overpowered by his lust for shiny things.

Okay so how did Barahir and Emeldir have a dragon baby? Were they dragons too? Not necessarily. We know the Uruloki are Maia who have taken possession of constructed bodies. What if one such creature possessed baby Beren in utero?

Anyway, this is me picking the first few examples that sprang to mind, but the text is full of proof if you read between the lines.