When pet owners go on vacation they can hire a pet sitter. Dairy farmers have a tougher time when they have to be away from their herd, but where there’s a need there’s a business model. Brian Herr is a professional relief milker in Wisconsin, hired to tend to dairy farms when the owners are on holiday or at conventions. Milking is of course only part of the duties. Herr feeds the cows, makes sure they are healthy, and performs other chores around the farm. Sometimes he’ll stay at the farm, but more often he commutes. Regular customers plan vacations around his availability.