Board Thread:Lore Discussion/@comment-27974508-20160317040520/@comment-27913894-20160321175814

Well, let's see in which ways they are immortal and mortal respectively.

Age - Immortal, cannot die from the passage of time

Wounds - Can be killed by physical wounds until resurrected

Starvation - Currently unknown

Dehydration - Currently unknown

Disease - Currently unknown

Considering how there are no known records of Dov succumbing to the last three potential causes of death in a biological being, it's quite possible that they are either highly resistant or immune to disease, and do not rely on biological sustenance in the form of food and water to stay alive.

As for the way in which they can die, they can, of course, be killed through physical wounds temporarily until resurrected by another Dov, but a Dovahkiin would be the optimal choice to permanently kill a Dov by absoring the Dov's soul, as confirmed in Skyrim, which is canon.

Unfortunately, until we get confirmation from Bethesda in the form of canonical lore from a main series title, we cannot be certain on this topic.