Missing Mini Schnauzer

Our 10 lb. Mini Schnauzer is missing. He walked out of our gate that the gardeners left open this morning before we realized it- we're in Cypress Creek Lakes. (Cypress, TX) He's been missing over 12 hours... Please contact Jane at 713.677.1138 if you know his whereabouts. Thank you!
His is not microchipped. My email address is jwhatley@interfin.com . He was not wearing a collar. He's salt/pepper, 14 years old, almost deaf & blind, 10 pounds. Thank you!