Rick Ruddick and his border collie sheepdog Tango demonstrate how they work together in front of third-graders from Lincrest and Riverbend Elementary during the annual Farm Day at the Yuba-Sutter Fairgrounds in Yuba City on Friday, October 12, 2012. About 1,200 area third-graders attended the annual event sponsored by the Yuba-Sutter Farm Bureau.