On the eve of his death, an unnamed narrator opens the story by proclaiming that he is sane, despite the wild narrative he is about to convey. This narrative begins years before, when the narrator’s honorable character is well known and celebrated. He confesses a great love for cats and dogs, both of which, he says, respect the fidelity of friendship, unlike fellow men. The narrator marries at a young age and introduces his wife to the domestic joys of owning pets. Among birds, goldfish, a dog, rabbits, and a monkey, the narrator singles out a large and beautiful black cat named Pluto as his favorite. 

Though he loves Pluto, the narrator begins to suffer from violent mood swings, predominantly due to the influence of alcohol. He takes to mistreating not only the other animals but also his wife. During this uncontrollable rage, he spares only Pluto. After returning home quite drunk one night, the narrator lashes out at Pluto. Believing the cat has avoided him, he vengefully grasps the cat, only to be bitten on the hand. In demonic retaliation, the narrator pulls a penknife from his pocket and cuts out one of the cat’s eyes. Though the narrator wakes the next morning with a partial feeling of remorse, he is unable to reverse the newly ominous course of his black soul. Ignored for certain now by the wounded cat, the narrator soon seeks further retaliation. He is overwhelmed by a spirit of perverseness and sets out to commit wrong for the sake of wrong. He hangs Pluto from the limb of a tree one morning.