Wikia

CuSith is a Death Hound.

He can be found, just like Garmr, walking around the dining hall inside Castle Volkihar and can become a follower if the Dragonborn is a Vampire Lord.

TriviaEdit

CuSith is a reference to Cù Sìth from Scottish mythology. He was a large, ghostly hound associated with death.
CuSith can send Hired Thugs after the Dragonborn if they steal something from Castle Volkihar, even if he is killed during the quest Kindred Judgment if the player sided with the Dawnguard.

Creatures and Enemies (The Elder Scrolls V: Dawnguard)
Named Creatures	Arvak • Bran • CuSith • The Forgemaster • Garmr • Naaslaarum • Sceolang • The Reaper • Voslaarum
Docile Creatures	Ancestor Moth • Armored Troll • Armored Frost Troll • Bone Hawk • Frost Giant Husky • Shellbug • Vale Deer • Soul Wisp
Hostile Creatures	Ancient Frost Atronach • Chaurus Hunter • Chaurus Hunter Fledgling • Death Hound Falmer Warmonger • Feral Falmer • Frozen Chaurus • Frozen Falmer • Gargoyle Brute Gargoyle Sentinel • Legendary Dragon • Revered Dragon • Spriggan Earth Mother • Vale Sabre Cat
Undead	Boneman • Keeper • Mistman • Wrathman • Nightlord Vampire • Nightmaster Vampire