While the theme of this is incredibly vague and ambiguous, I suppose it could have something to do with not pushing luck??? I honestly am having a lot of trouble digging out any meaning of this story. For tone, I would say it is kind of a nonchalant bizarreness. Nobody really finds it astonishing that a cat can talk and everybody just accepts it. Also, the tone has a very dry humor sprinkled around it. Cornelius' death is almost a joke as an elephant killed him. It kind of points at a cartoon-like image of a man being squished like a pancake by a monstrous mastodon.