Droving is the practice of walking livestock over long distances. It is a type of herding. Droving stock to market—usually on foot and often with the aid of dogs—has a very long history in the Old World. An owner might entrust an agent to deliver stock to market and bring back the proceeds. There has been droving since people in cities found it necessary to source food from distant supplies. Droving is the practice of moving livestock herds over long distances by walking them "on the hoof", sometimes several hundred kilometers. It was carried out by shepherds. The earliest written evidence about shepherds and their dogs dates back to the 14th century. Thousands of cattle were moved along the roads of Europe and Great Britain, and later sheep, goats, pigs and even geese and turkeys. The journey from pasture to market, slaughterhouse, or buyer could take anywhere from a few weeks to a few months. The herd moved during the day at a speed of 2-3 km per hour, and stopped at night to rest and graze. During the day, herding dogs ensured movement, made sure that the animals did not wander off, and at night they guarded the herd and the carts of the shepherd with their families from remaining predators, but mostly from hungry village dogs. The activity of sheepherders lost its exceptional importance for the economy only in the middle of the 19th century with the development of railway transport. Since the 1960s, the automobile transportation of livestock in special vans, which has become common, has finally replaced the commercial droving of herds. The profession of shepherd or drover is retained in some countries as a seasonal job for moving cattle and sheep to and from summer pastures. The dogs used for droving were quite large and high-legged, tireless, aggressive and extremely independent, they did not require special training and the ability to interact with other dogs. Forcing the cattle to move in the right direction, the droving dogs treated them rather rudely, biting the cows, pushing the sheep hard with their bodies and biting them.