Annie, an approximately 4 year old rescue GSD has shown a quirk that I’ve yet to encounter. When I have her outside and someone sets off a firecracker or shoots a gun she has an interesting reaction. I’ve encountered dogs that are gun shy and dogs that don’t give a flip, but she‘s different. When Annie hears a shot she will drop what she’s doing and jump to a spot 3 or 4 feet in front of me in the direction that the noise came from- stiff body, fur bristled, and all ears. If it’s close or loud enough she will bark and that’s the only time that she ever barks. Any idea what’s going on with this? Just a quirk or something she’s been taught, maybe?