I was faced with this same situation in the middle of June here in New Mexico one time. I waited by the car for about 5 minutes before going to my truck to retrieve a hammer. When I returned a man was there opening the car. I spoke quite harshly with him only to find out this was his service dog! He was deaf, so my yelling at him was unheard, but I am certain he got the message. The outside temp was over 100 degrees and that dog was literally being cooked in that car. Had not the man been there when I got back with my hammer he would have found all his windows broken out with a happy and cool dog. I had no intention of waiting around if I had to have broken the windows. Some people are just so very stupid!!!
That’s the ‘thanks’ the poor service dog gets for all he’s done for the guy. Unbelievable.