The inside layout was designed by Jennifer Niederst and Nancy Priest and implemented in FrameMaker 5.0 by Mike Sierra. The text and heading fonts are ITC Garamond Light and Garamond Book. The illustrations that appear in the book were created in Macromedia Freehand 5.0 by Chris Reilley. Dogs most likely lived with cave dwellers to assist in hunting and to protect the clan. It is possible that scavenger dogs adopted humans, rather than the other way around, as potential providers of food, i.e., table scraps.
Dogs are probably descendants of wolf-like creatures.
Thousands of years of breeding dogs has led to hundreds of varieties. Dogs have been bred and trained for many purposes, including hunting, herding, sports, security, and life-saving. They have been proven to have a positive effect on the well-being of people and to contribute to the quality of human life. Humans have also bred dogs for less benevolent uses, such as fighting, causing a loss of anti-aggression blockers in otherwise tame and nonviolent breeds. However, most breeds of dogs make excellent companions for humans.