I love the way the vampires in the DG dlc look and act compared to the regular ones you find in Skyrim. Just sayin.

Dawnguard changes the normal vampires too.

Sybille Stentor, the court wizard in Solitude for one. After DG gets installed, she's sporting vampiric red eyes.

Which explains the stuff she does to prisoners in the dungeon(feeds on them,) and why she had you clear out a vampire lair after dead drained bodies were being found in Solitude. She was covering her own tracks.

Ah that makes sense. I never really noticed her being a vampire to begin with. Then again, didnt really notice all the regular vampires in the regular game getting the glowing eyes. Thats just bad a**