Yah that’s hard for sure, I think there are a few things going on that I can think of : 1) trying to normalize or take the edge off how the dog reacts to buzzing, noises in the building that trigger the dog 2) trying to find a way to make you leaving a positive experience for the dog.
Tiring the dog out is a good way to help but I think the other two are prolly what’s driving it.
For years we’d crate the dog, then penned him when we weren’t home and he’d bark….finally we caved and he jumped up on our bed and chilled…..I guess what I learned was finding what made him comfortable and it’s a fine line.
It was painful though, if we left thr house, forgot something….if we went back he’d just start barking…..