The downstairs neighbors acquired a new dog.
It is suffering acute separation anxiety while they are off at work.
It started this morning by waking me at 0700 hours with its whining & howling.
It has not Shut. Up. since then.
I can at least take a little bit of schaedenfreude from the thumping and banging noises suddenly emanating from downstairs.
It sounds like something big & expensive is getting tore up.