The only thing that I can think of is it sounds like another dog.
I used to think it hurt their ears, but now I'm not so sure.
Our dogs Shadow and Dio never howled at the siren until we got our newest edition (Benson) in December. (We've had Shadow four years and Dio three and we've lived in the same house.)
He first started howling at the noon whistle, now he howls at the sirens too.
He could be laying down, sleeping, the minute the whistle goes off, his head comes up and he will listen to it. He doesn't start howling until the whistle is dying down and almost done.
I guess when Shadow and Dio seen and heard Benson howl they thought "OH! So that's what we're supposed to do!" and decided to join him in a chorus.
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