User blog comment:Mythicdusk/Volkihar Clan/@comment-4057437-20120612031126/@comment-4779287-20120612175406

Well, apparently the process involved in becoming a Vampire Lord and joining Volkihar removes Lycropanthy all together. And as for joining the Dawnguard as a vampire.. it is highly unlikely that a vampire would be allowed to join. My guess is that their will be some sort of "initiation" of their own used to confirm you're not a vampire. But it's all speculation, it just doesn't seem like this ancient group of vampire hunters would allow the very thing they hunt to infiltrate their ranks so easily.