We've had some turnover upstairs: two people moved out, one stayed and his girlfriend moved in along with him. It's a three-bedroom apartment, so I don't know what two people are doing with all the extra space, not to mention spending all that money on all that extra space.
The young lady brought with her a dog. It's a pug, and while cute, like many breeds of smaller dogs it barks a lot. It barks when someone leaves or enters the building, it barks when the Mrs. pulls into the driveway, it barks when I take our dog out the back door for a walk and when I bring her back in. So fat it's been just intermittent.
Due to various things, including some work that the landlord had done after September 1st, today was the first day the dog was left alone while both people went off to do whatever it is they do. It was barking when I got up around 8:30 this morning, and it barked pretty much nonstop until around 11, when it took a breather for 10 minutes or so. I kept waiting for it to stop simply as a result of wearing itself out from the physical effects of barking so much.
After that point it was more intermittent, then I left the house shortly after 1 pm and was gone for three hours, so I don't know what happened during the afternoon. I asked our dog when I got home, but she declined to answer; dogs don't snitch on each other, I guess.
It barks in clusters, like this: "yap yap yap yap (short pause) yap." (Five-second pause.) "yap yap yap yap (short pause) yap." And yes, I noticed this; it was hard not to notice it when it was being repeated over and over and over.
There are other dogs in the neighborhood that bark a lot, including a couple that are left outside for long stretches of the day more or less year-round (which could be the reason they're doing all that barking). But they are several houses away at minimum, so their barking is more of a background noise.
It may be that the pug is still getting used to an unfamiliar place; it may be that she hasn't been left alone before (I believe that the young lady previously lived with her mother). And in another month or so it will be time to close the windows, at which point I hope it won't be quite as noticeable.