If they are made aware their muttley is a barker and non stop pain in the butt to others---YOU WOULD THINK they would leave the thing in a kennel, with a friend at home, train it somehow or someone stay with it.
You would think that they would take some action! What do they do? No idea. I hope they would be the one to correct the problem and not leave it to annoy others.
Mine isn't a barker thank goodness. We leave him but stayed outside the camper for a good bit making sure he didn't bark. One the first trip out leaving him we asked the neighbors who were outside hanging around to listen for us a bit, when we got back they said he watched them from the window for a bit but never once barked. Nice neighbors to do that for us and we were happy to know our dog wasn't a barker.