The cat's dream reputation is split down the middle of its history. In Egypt cats were sacred to Bastet, mummified in their thousands and mourned by households; killing one, the Greek visitors reported with astonishment, was a capital matter. Medieval Europe reversed the valuation, binding the cat, especially black, to witchcraft as the familiar spirit in animal form, and the split survives in living folklore, the black cat lucky across one border and unlucky across the next. A dream cat arrives carrying both inheritances at once.
The interpretive traditions read the cat through its manner. Where the dog of dream convention is loyalty, the cat is self possession: affection on its own terms, presence without obedience. The Jungian line reads cats toward the feminine and the instinctive, sensuality, independence and the uncanny poise of a creature at home in the dark, and it is that school's language the popular dictionaries compress into intuition and mystery. Folk registers read scratches toward treachery and a purring cat toward comfort or flattery as the dictionary pleases.
Interpreters across schools agree on one working rule: the dreamer's waking relation to cats, love, allergy or fear, sets the image's baseline before any symbolism is read, since few animals divide sleepers so cleanly. The readings are recorded here as the traditions' own, Egyptian reverence and medieval suspicion included.