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I suspect this an adaptation of a short story by Edgar Allen Poe in which a man kills a kitten and its mother takes revenge - can't quite recall the name
Elderly curmudgeon and awkward person. Professional old fart.To AgProv — the story you're thinking of is "The Squaw", by Bram Stoker (I recognize it because I read it recently in a short anthology). It's not a match for the description that Bergamot gave though, since the cat in "The Squaw" stays a cat until the end. (Unfortunately, I don't recognize the story they're asking about.)
Until next time...
Anon e Mouse Jr.
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This would be a very old Gothic novel—I remember it having one of those great painted covers of a woman in a flowing white gown in front of a big spooky house—probably from between 1940s and 1960s. The premise is that, for whatever reason, one of the villain's particularly cruel acts is killing a cat by dropping it down a well. Then a mysterious, beautiful woman with green catlike eyes shows up and starts systematically ruining the villain's whole life and exposing every terrible thing he's ever done, with the strong implication that the woman is in fact the cat, come back for revenge. The title of the book may have been the woman's or the cat's name.
Edited by Bergamot