MANSFIELD — It was big day for canines and sheep at the Richland County Fair on Sunday — in terms of royalty. Weston Rehberg, a Shelby Whippet, and Kaley Bowman, a Madison Ram, were chosen as Junior Fair king and queen in competition at the John Hart Building. The 17-year-old Rehberg, a member of the Roaming Rovers 4-H Club and Shelby FFA, shows market ducks at the fair. He will be a junior this academic year. He is the son of Vince and Jennifer…