Vague memories of a weird movie I saw as a child

I remember watching part of a movie as a child, but I can’t find it anywhere. It was black and white, an older movie. Definitely had 1950’s era horror vibes. This man for some reason wound up in an old house in the woods. I think either his car broke down or he may have been visiting the people who lived there because they were old relatives or something. There was an old lady who was dying and she tells him something important. I think they might be related? Or she tells him that he’s next? Then her body starts glowing and she dies. He’s visibly distressed and looks out the window, where he sees a lone white wolf. The wolf also glows. There were a bunch of other people who lived in the house. I think that some of them refused to talk to him or something. I know this is super vague, but I’ve been trying to figure out what this movie is for YEARS lol. I’m beginning to think that I somehow imagined or dreamed it.

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