The superstitions surrounding black cats varies from culture to culture,
but black cats have positive associations in the Celtic nations and
Japanese folklore.[5] Black cats were sacred in Celtic mythology.
Scottish lore holds that a black cat's arrival at a new home signifies
prosperity, while Welsh lore states that a black cat brings good health:
Cath ddu, mi glywais dd’wedyd, A fedr swyno hefyd, A chadw’r teulu lle
mae’n byw O afael pob rhyw glefyd. A black cat, I’ve heard it said, Can
charm all ill away, And keep the house wherein she dwells From fever’s
deadly sway. —A Welsh folklore rhyme, 1896[6]