This was naughty on me.
Last year we were pheasant hunting in Westby MT (about 6-7 of us) and a few guys had just covered a corner fence with lots of brush and a big old gnarly tree in the barrow pit. We were all standing there, there were at least 4 dogs as well when my dog Schnitzel went rock solid point at the tree. A few of us walked around the tree trying to jump another bird- nothing.
I figured it was a false point- he had picked up old scent or something.
As we all started walking away, 3 roosters flushed from the brush and flew off!
You could see it in my dogs eyes- he was like "WTF? I TOLD you they were there..."
Happens all the time with dogs. Gotta love it..