24-hour dog bark
It is as if someone put a track of a barking dog on loop and let it play 24/7. These are the conditions that one NYC resident lived for a year before they decided enough! Dealing with a barking dog is bearable in some cases.
But in cases where the dog never ceases, there is nothing bearable about this situation at all. I had a similar situation once. I lasted one week, so kudos to this person for sticking it out for so long with all the noise and lack of sleep they must have dealt with.