Um okay u should just go to different neighbors houses and ask them if it belongs to them and also just tell them if they could shut the freaking dog up but in a polite way say all the neighbors agree cuz they might take it really personal and also if u go to different neighbors houses tell someone to come with u cuz its dangerous if u just keep knocking on different ppls doors
Try inviting it in, give it a snack and then a big hug and kiss. Maybe that's all it wants is love. Can't hurt. P.S. Does it even bark when you're dreaming?
Take it door to door to your neighbors, or take a photo of it and show your neighbors. Whoever it ends up being explain the issue, and explain you and others are very annoyed by the dogs behavior and to control it, but be nice about it because if you're rude about it they'll most likely do nothing.
Kidnap the dog and cut his vocal cords.