Killing a dragon with a single Dragonrend shout?

My character is level 19 and I came across a dragon and went about to kill it the usual way (Dragonrend, Sword hacking).

Only this time, the dragon just died when I used Dragonrend. Is this possible? Are there weak dragons to look out for in Skyrim for some quick dragon souls?

EDIT: This is after I have:

already killed Alduin and Paarthurnax.

2 Answers

Dragonrend apparently does an unspecified amount of health damage over time to dragons. Are you sure the dragon was at full health when you shouted at it? They are surprisingly frail creatures, when matched against groups of bandits or a giant.

well sometime the dragon has low life because the dragons wil get in fights with each other, because it says that when dragons use the frost breath or fire breath, they are having a strong verbal communication. so the dragon was probobly in a fight before it landed then when u used the dragon rend it finished it off, also some dragons are weaker than other, like the dragons that just say Dragon, they are weaker than the ones with names.