QUOTE(hujan86 @ Mar 15 2017, 19:56)

When I think more about it, Smaug was really weak. Sure getting hit by the Black Arrow would hurt, but it shouldn't have killed the dragon almost immediately. The arrow doesn't even pierce into the flesh completely.
Glaurung -- the first of Smaug's ancestors -- was killed by a sword-thrust to the belly. Also, Smaug, being the last of his race, was probably not as powerful as the dragons that existed during the time of Ancalagon the Black.