The different animals have different meanings in the dreams. The animal that is seen in the dream being angry and aggressive one shows these features in your personality. Perhaps you have some suppressed anger issues that havent been showed for others for a long time. The cute and not aggressive animals foretells about soft side of your personality. These explanations could be applied not only to you, but to people around you either.
Read more about dreaming of Animal in other dream meanings interpretations.