I'm just back, I searched the whole of the woods where he was last seen, then when Nicola arrived we searched a lot of the surrounding area, asking people if they had seen him, but he could be anywhere. There are fields for miles, and it would have been impossible for us to cover the whole area.
I might go back over in the morning and search Mugdock Country Park which is a couple of miles past the area, and has moors where dogs could easily get lost, but hopefully there will be at least one sighting by then.
If anyone else is willing to help, please let us know.
(Posted at same time as Nicola)