Programs at a Richmond farm that offers animal-assisted services and therapeutic horseback riding have been canceled until at least Tuesday after the non-profit's staff found its main building vandalized Friday morning. Police are investigating a possible break-in at Main Stay Therapeutic Farms, 6919 Keystone Road, Richmond, where vandals smashed glass doors and sprayed the building with fire extinguishers, Shawna Egan, Main Stay's Director of Corporate and Community Relations said. Nothing was missing from the building, Egan said. "It doesn’t appear that they were after money," she said.