Oh my...I would've been in jail for breaking into that man's car to relieve that dogs suffering!
I think a fair punishment for people like this is to put them in a hot car locked and see how they like it!
However if I didn't want to go to jail...I probably would have exaggerated the condition of the dog to get that idiot 911 operator to do the right thing...or take down the license plate number and maybe reporting it to Animal Control...or video tape the whole thing and turn it over to a news channel...argh! People with no brains...it's sad!