The 9 Dragons of Middle Earth

Glaurung Size Chart by SyndarilArt on DeviantArt

Tolkien Time: The size of Glaurung

NO SPOILERS] Westeros's Drogon(short necked, younger and faithful) vs Middle Earth's Smaug(Long necked, badass, intelligent, without a master). Who would win? Personally, I prefer short necked dragons but Smaug might can easily

Dragons, The One Wiki to Rule Them All

Ancalagon the Black makes Smaug look like a little baby which just emerged from egg. - 9GAG

The Dragons of Middle-Earth. Their Physical Powers. Part II.

List of dragons in popular culture - Wikipedia

What is the size difference between Ancalagon the Black and Smaug? - Quora

Middle-Earth Comparison, Lord of the Rings vs Hobbit

Smaug - Wikipedia