Cats were often familiars to workers of magic because to anyone used to wrestling with self-willed, wayward, devious magic--which was what all magic was--it was rather soothing to have all the same qualities wrapped up in a small, furry, generally attractive bundle that...might, if it were in a good mood, sit on your knee and purr. Magic never sat on anybody's knee and purred.
Robin McKinleyHe grunted; she recognized it as relief that she wasn't going to nag him further about Tor the Just, who probably wasn't that boring if he could hold off the Notherners for nine days and melt a hole in the hills.
Robin McKinley