My Dad was a small time Minnesota dairy farmer. He loved herding dogs and always kept one. During summer, us kids unknowingly would train the dog. We would go out to bring in the cows at a certain time and the dog would hang with us. When we went back to school, the dog would pick up the routine and round up the cows and gently bring them in to be milked ~ always at the correct times.
Now single fields, even up north cover the area of what once was two whole farms.
When I go back for a visit these days, I miss the small dairy farms and am so amazed at the size of the fields.