It's never good to see a flash of dog run past your rear-view mirror when you're backing up a car, but that's exactly what had one Mazda CX-5 driver very, very concerned. And for good reason, as a video from a home security system shows the near-death encounter for a little Chihuahua.

"First I thought I had crushed my dog," the driver notes in a video caption.

Yet the video of the driveway itself captured something even more incredible—a true act of doggo-saves-doggo heroism.