Originally posted by EpicurusSmaug's eyes are also proportionately much smaller. What stupid ****ing logic.
We saw Toothless being roughly the size of its eye. We see a glorified midget being the size of Smaug's eye.Therefore, going by relative scaling, RD>Smaug in terms of size.
It's size was enough that by flexing alone it ended up shattering the mountain in which it resided.