Gunshots ( without silencers

) and depending which one was fired at the time, would have been heard in the still of night,with windows open before everywhere was locked up------------on the inside as well, because the sound/resonance would have been more marked. Sound,however slight is more audible at nightime,and carries a fair distance.
Why WERE the dogs barking when EP reached WHF ?

Especially Crispy who was inside ?