This reminded me of my uncle's dog. You should have seen it chase its tail. when I first saw it, it was very funny. But then it quickly became the saddest thing I ever saw. It would chase its tail for hours till it became exhausted. My uncle explained that it was imagining its tail to be some snake that caught on to it. The dog had imagination, except it was paranoid. It died a few months later exhausted, bitter and lonely.