The mood of a story is the feeling which the author tries to evoke in their readers. Everyone is different, of course, and so not every reader of a story will feel the exact same way. But authorial intention is important here, as it shows us what the author hoped to achieve in terms of stirring up the reader's emotions.
Different people will react to Poe's “The Black Cat” in different ways, but it's generally safe to say that the story's overriding mood is one of horror and disgust. “The Black Cat” is, of course, a horror story, so that's not altogether surprising. In the shape of the story's unreliable narrator, we're dealing with a very unpleasant man who's done some very unpleasant things.
First, he killed his cat Pluto by hanging the poor creature. He then went on to try killing his second cat, and in a fit of rage murdered his wife with an axe. We cannot help but feel horror and disgust at such revolting actions. Whatever led the narrator to carry out such foul deeds,...
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