Don eventually got to the center divider, and his motoring adventure was over when police collared him.
Traffic Scotland, the country's road monitor, tweeted about Don's ride as it happened and even managed to get two photos of him. Admittedly, Don certainly looked apologetic after causing such a scene.
Traffic Scotland @trafficscotland
#M74 (N) J13-RTC due to dog taking control of tractor... nope, not joking. Farmer&police at scene,vehicle in central res. #maycausetailbacks
10:34 AM - 22 Apr 2015
Here is a pic of the dog from the tractor incident on the#M74. The dog is called Don and is a collie #inthedoghouse