I see various threads on barking and I do have a problem with Fraser barking outside, but i don't understand why he does it. When I'm outside with him, he doesn't bark as I've got him busy chasing frisbee etc. During the day though, he'll ask to go out and runs immediately to the fence and start barking and then run down the fence and around the garden barking. There's nobody there, not other dogs, no deer or other creatures, no particular noises. He just runs out and starts barking. I've tried waiting to see if he gets over an initial impulse on first getting out, but it seems it will carry on for a while and I don't want to disturb the neighbours. So, he asks out and as soon as he runs to the fence and starts his barking, I call him back inside and he comes quite readily as he gets a treat. What I don't understand is why he's doing it. There doesn't seem to be a specific stimulus. He's just developed the routine of barking when he's out by himself. Thoughts? Theories?