What are some dog-like mythical creatures?

Cerberus, guarded the Underworld in Greek Mythology. Anubis, the Egyptian God of the Dead, had a jackal for a head, which is close enough to a dog. Scylla in the Odyssey had six or so heads that looked and barked like a dog, and Odysseus had a dog named Argos. Who died after seeing him for the first time for twenty years. I cried a little inside when that happened.