http://en.wikipedia.org/wiki/Fenrir

"In Norse mythology, Fenrir (Old Norse: "fen-dweller"),^[1] Fenrisúlfr (Old Norse: "Fenris wolf"),^[2] Hróðvitnir (Old Norse: "fame-wolf"),^[3] or Vánagandr (Old Norse: "the monster of the river Ván")^[4] is a monstrous wolf"

well according to wiki...the wolfpack were in the right area, I suppose but 'not quite':

"In chapter 51, High foretells that as part of the events of Ragnarök, after Fenrir's son Sköll has swallowed the sun and his other son Hati Hróðvitnisson has swallowed the moon, the stars will disappear from the sky."