Maybe animal control/Sheriffs office, a guy from the local search and rescue? It could be a kid. The point is that you could possibly spot him from above flying a drone.
Your little buddy may have gotten his collar snagged on something and is stuck.
Get a drone up and fly a circle search pattern from the last known location.
THE CHAIR IS AGAINST THE WALL.
The Tikka T3 in .308 Winchester is the Glock 19 of the rifle world.