Update: New York State Police say 77-year-old Robert Mason has been found safe near Rochester.
Original story: A missing vulnerable adult alert has been issued for 77-year-old Robert Mason, of Clarence.
Police say Mason has dementia and may be in need of medical attention.
He was last seen on Huntington Valley Drive North in Clarence at 2:00 p.m. Wednesday.
Police say he was driving a 2013 white Ford Escape with New York registration HFM-1150.
Mason was last seen wearing a black and gray jacket, blue pants and black shoes. He was accompanied by his Sheltie dog.