The narrator, a loving and caring man, and his wife own many pets/animals and enjoys having them, but the narrator's favourite is his large, black cat Pluto.
The narrator begins to drink and gain a massive temper and impatience which causes him to become hostile and cold hearted. He first abuses his other pets, then begins to say things to his wife and harm Pluto. He eventually end up hanging his once beloved cat. Guilt then begins to take him over.
The narrator finds a new cat while at a bar. The cat follows him home and shows fondness to the narrator, but the fondness from the cat "disgusts" him. Alas, because of his guilt, he avoids the cat and doesn't do anything to harm the animal.
The narrator is angered by the cat walking between his feet. While walking down the stairs he takes an axe and goes to swing at the cat. However, he ends up missing and hits his wife with the weapon instead.
The narrator killed his wife and when he went to hide her body, he found that the cat was missing. It wouldn't show up at all and there was no evidence that is was nearby.
The narrator has officers at his home. While they are searching for the body, everything seems fine until there is a scream and arms tear the wall in front of the body apart. The cat and body of the wife are revealed.