Genuinely curious what the underlying observation was. the area sits in a long east-west valley that’s perfect for acoustic ducting, and by the mid-1960s Warren County and neighboring towns all had civil-defense/fire sirens that used a rising-falling “wail” tone. If two or three sirens ran in quick succession they could easily have produced that woo-woo-woo sound, deafening volume, and eerie sense of a single source racing down the valley. The animals’ sudden silence could be shock reaction to the low-frequency onset of a loud siren.

Anyway. That was a well recounted story.