Good for you!!!
I posted a similar thread on YT awhile back and got very mixed reviews about it. I ended up having to defend myself for trying to save the dog.
http://www.yorkietalk.com/forums/showthread.php?t=78875
I tried to find the dog's owner and save them the police call, busted car window, embarassment, etc... and to try to get help for the dog ASAP.
Next time I will call the cops or animial welfare folks.
Thanks for your post.