Animal control or the police will issue a ticket to the owners of this dog if they don't comply by putting a stop to the barking. I know this because my old dog Ripley got me a ticket once!
We lived in an apartment complex and Ripley had severe seperation anxiety! We tried everything with him. He was on Clomicalm for a while, no change....we tried a citronella collar, no luck! For years we had to bring him with us everywhere we went! And I mean everywhere!!! If we went to the store, he came with us and was left in the car with the heat/air conditioner on and the window cracked. (He was a small dog FYI)
Anyway, because of miscommunication between my sister, mother and I, he was home alone for a few hours one night and the neighbors called the police. They gave me a ticket with a $25 fine but we went to court and the judge told us we had one week to find him a new home!!! I burst into tears of course! Turned out the baliff and the court clerk were married to each other and member of a Shih-tzu rescue group so they took him in. He still lives there with their two other dogs and is doing great. They have a big house with no neighbors.
So, if you do call animal control, keep in mind that the neighbors may choose to get rid of the dog and may not be as lucky or as kind as my mother and I. Do you know the neighbors? Can you talk to them about the dog first? I would hate to see the dog brought to a shelter...