The poster is good, but he no longer has a tag on as his former owner took it off yesterday, he is still wearing a collar though. He also had a red slip lead on, and I looked everywhere for it, hoping to at least find that, but didn't.
It's so difficult to know where to actually search without a sighting, I noticed the woods are directly under a flight path, and when he was staying here he was scared of loud noises, so possibly would have gone further away from the area. The West Highland Way starts near there, so he really could be miles away by now.