So we knew he wanted the chickens. We have a hen house and we put an enclosure around it.
Patch went wildly barking and circling the enclosure, trying to get at any chicks who came near him.
We have a 5.5ft fence at the front of the garden, so we blocked off the path to the garden, leaving the yard for him to roam, while we thought of a solution.
Except he can now take a standing-start jump from the ground to the fence and scrabble over the top 
It's very clever, but the novelty wears off and he's been carried back over the fence at least half a dozen times since learning to do this this morning.
Clicker at the moment is no good whatsoever. In fact, even waving a whole packet of the smelliest smoked ham at him barely saw a break in his stride (one nostril twitched
).
I know that theoretically I need to desensitise from where he is not aroused, but he can see them from the lounge window and is sensitised even there.
Do I start in the Hallway??