animal in Norse mythology

In Norse mythology, Sköll is a wolf that chases the sun (Sól) through the sky every day, trying to eat her. Sköll has a brother, Hati, who chases Máni, the moon. At Ragnarök, both Sköll and Hati will succeed in their quests.

"The Wolves Pursuing Sol and Mani" (1909) by John Charles Dollman.