SKOLL

In Norse lore, the wolf Skoll (one who mocks) chases Sol (the sun), while his brother Hati (one who hates) chases Mani (the moon) in hopes of devouring them. In some sources, however, it's not clear which brother chases which entity.
The siblings are the sons of the monstrous wolf Fenrir (the arch-wolf), and it is said that at Ragnarok, Skoll and Hati finally catch up to their prey, swallowing them and causing the sky and earth to darken and collapse, while their father defeats Odin.