Perhaps he likes things the way they were/are, perhaps he realizes how futile tidying is. Maybe you could teach him to bark on command by putting a name on the behavior. I was told that teaching them to bark on command would make it easier to get them to quit barking. With the dog I first tried it with, it didn't work that well.
BTW mine act like they're being slaughtered when I pull up the driveway. And I haven't found the off switch on that one.