death smiles on a murderer (1973)

Unknown.
A bizarre mix of horror and suspense, this Italian film sees a husband and wife both fall for a woman they have taken in whilst she has amnesia. When the wife gets jealous and locks the girl in the cellar, telling the husband the girl has left, a cat looks on impassively.
The cat lazes around in a number of scenes, before it is used to attack a man towards the end of the film. This makes a change, as usually the man would be killing the cat!

the fifth cord (1971)

Unknown.
Woman sits up in bed listening to some classical music, as her cat watched on impassively. So you know somethings going to happen shortly to disturb the peace.