There is a story told by the American Indians that the Great Spirit decided to divide the worlds of animal and man so he gathered all living beings on a great plain and drew a line in the dirt. On one side of the line stood man——on the other side stood all of the animals. And that line began to open up into a great crevasse-and at the last moment before it became unreachable, dog leapt over and stood by man. ~~Unknown
Thanks mikec256!