Mad Dog – Dreaming about a mad dog or a dog with rabies can be very frightening and might even constitute a nightmare. This symbol is highly allegorical and its true meaning is often difficult for even the most experiences dream interpreter to understand. One of the more common meanings that this symbol carries with it is that you have something attacking you from the inside that will destroy you if you do not get help. Rather than this being guilt carried by making a bad decision, it is more like a certain aspect of you is like acid to your soul. You might have an anger problem or be very resentful and it is eating inside out.