notice the men are wearing aprons. look up history of Rottweilers. they go all the way back to ancient Rome. Rotts used to be known as butcher's (aprons) dogs. They would pull the butcher cart.
"…in German as Rottweiler Metzgerhund, meaning Rottweil butchers' dogs, because their main use was to herd livestock and pull carts laden with butchered meat to market.[3] This continued until the mid-19th century when railways replaced droving. Although still used to herd stock in many parts of the world"
https://en.wikipedia.org/wiki/Rottweiler