Leo the Road Rage dog was indeed a real dog, even a real Bichon Frise. His story is this:
in heavy traffic, his owner *tapped* by mistake the rear end of the car in front of them. The man, enraged, pulled off the road, the lady (Leo's owner following suit). The man walks towards the car angrily. The lady rolls down her window to see what he has to say. Leo jumps in her lap and starts barking at the man. Upset, the man grabs Leo, *through the rolled-down window* and throws him out into traffic where the poor dog was almost instantly run over and killed.