Engravings found in Shuwaymis, a hilly region of northwestern Saudi Arabia, and dating back more than 8,000 years show humans accompanied by dogs. Some of the dogs have what look like leashes running from their necks to the human. The depiction of leashes is by far the oldest on record. Until now, the earliest evidence for such restraints came from a wall painting in Egypt dated to approximately 5,500 years ago.
Maria Guagnin, an archaeologist at the Max Planck Institute for the Science of Human History in Jena, Germany, has been working for the past three years to catalog all the engravings found at the Shuwaymis site and another site, Jubbah, 200 km to the north. She worked with zooarchaeologist Angela Perri, at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, to analyze the engravings. You can read more about this story at Science.