It's NOT your place to punish the DOG. And it doesn't matter what issues the owners have, they NEED to take responsibility for their frigging dog. Write a LETTER, detailing exact times and dates of when the dog barks, and then send the letter to them requiring their signature. Once you know they get the letter, if the dog continues barking, call the Animal Control, and demand these people get cited, and be sure you show them your letter. Do this everyday, and eventually, the owners will have to go to court. OR, go down to the animal control office and ASK them the exact steps you must take to get this taken care of.