I don't see the big deal either if it is done properly. We lock the doors with the air conditioner going too. I wouldn't do it if I was going shopping for a long period of time, but if its a errand that doesn't take long. I don't see the big deal in it.

I believe that CagneyDog does whats best for her dog. She knows what her dog likes/dislikes. I don't think she would take the dog if she believed it was in any harm at all.