These maybe the first images of dogs, and they’re wearing leashes (2017)

And those lines are probably leashes, suggesting that humans mastered the art of training and controlling dogs thousands of years earlier than previously thought. For the past 3 years, Maria Guagnin, an archaeologist at the Max Planck Institute for the Science of Human History in Jena, Germany—in partnership with the Saudi Commission for Tourism & National Heritage—has helped catalog more than 1400 rock art panels containing nearly 7000 animals and humans at Shuwaymis and Jubbah, a more open vista about 200 kilometers north that was once dotted with lakes. The researchers couldn’t directly date the images, but based on the sequence of carving, the weathering of the rock, and the timing of the switch to pastoralism, “The dog art is at least 8000 to 9000 years old,” Guagnin says.

Source: www.sciencemag.org