Why dogs really bark for "no reason" and are a good sense of character

They run on a different sensory vibrational frequency range so could be responding to the presence of entities that are out of our usual frequency range that we can not perceive. higher vibrational beings(angels) and lower frequency beings(demons) of which we can only perceive in times of great love and great fear(the only baseory emotions) or through mastering the aspects of body, soul and spirit. Also possibly why cats where so revered in Egyptian culture and have a good sense of human character.