User blog comment:El Alamein/Braxas vs. Smaug/@comment-4098900-20120831000516/@comment-4661256-20120831021758

There is no definite size specified for either dragon, so my blog said their height is less than 40 feet and greater than 20 feet; likewise their weight is less than 6 tons and more than 4 tons... however, looking at both dragons, I would assume Smaug is bigger - not height-wise, but becuase of his overall build. Look at how slim Braxas is. She's not underweight or anything, that's just her build. Smaug likely has a much fuller build.