Wow, scary!!!!! I never even thought they could do MORE damage! Bodhi travels in the boot (trunk?).... I couldn't fit a crate in there.
My dogs never ever ride in the cargo area of my hatchback. It's either the back seat with a hammock seat cover and zip line, or the front seat buckled in with the airbags off. Clearly after seeing these videos that's not as safe as I once thought, but it's more likely a dog will need restraint during quick stops and lighter hits, and my current systems keeps them comfortable and restrained in those cases. I really don't see any practical AND effective restraint for major crashes now, unfortunately. I am really wondering how the Roadie holds up, though. Currently Gavroche wears an Easy Rider and Logan wears his leather working harness in the car.
I would think the chance for this sort of thing happening with a small dog is less. There's not as much mass there to fling around. When I had Tango I had him in a floatation vest with a traffic loop attached in the car. Not sure how safe that could possibly have been, but it was all that would stay on him without slipping since he's a tripod. A crate was not practical with my setup at the time (though he did ride in a crate until he was healed from surgery).