A cave-dweller is a prehistoric person who lived in caves. The dog was a man's best friend even during the prehistoric period.
The prehistoric man was still a part of nature, wilderness, while the modern man is assosicated with civilization. The definition of civilization is: <em>a complex human society, usually made up of different cities, with certain characteristics of cultural and technological development.</em> All of this can't apply to the said <em>cave-dweller</em>.
