This piece of crap was wanted for vandalism, and led CHP officers on a high-speed chase Thursday afternoon on several different L.A. freeways ... before exiting onto surface streets in the suburb of Pomona.

The guy didn't appear to slow down at all when he shockingly threw the dog out of his vehicle, forcing the pursuing police units to swerve around the poor animal.

Unfortunately, it's unclear if the pup even survived the fall from the truck.

As for the jerk behind the wheel ... he went on to hit 2 other vehicles during the chase -- the second one being a head-on 60 mph collision that brought the pursuit to an end.

Cops quickly surrounded his truck, and shouted instructions, but he would not get out on his own. Officers eventually used non-lethal rounds to shoot out his window, and then dragged him out and arrested him.