CONCORD, Calif. - UPDATE: William Findley and his dog have been safely located in Antioch.
William John Findley was last seen on Oasis Drive in a residential neighborhood in central Concord.
He is 5-feet-7-inches tall, with blue eyes and white hair, believed to have last been wearing blue jeans, a blue windbreaker and a baseball hat. Police said he suffers from a medical condition that sometimes leaves him disoriented. He may have his dog with him.
The Contra Costa Search & Rescue Team worked throughout the night to find him, but so far have been unable to find him, police said.
Anyone who sees Findley is asked to call 9-1-1.