By the end of the experiment, after 30 minutes in a hot, parked car, the temperature was 117 degrees. Ward made it, but he acknowledged that he had the benefit of being able to sweat - something dogs can't do - and knowing that he was in control of the situation.
A dog trapped in a hot car would feel the same heat and desperation that Ward did, but a dog would also be scared, confused and unable to free himself.
"You can make all the excuses you want. You can say it will just be for a second, I'm going to leave the windows cracked, it's a breezy day, it's not that hot - but those excuses are meaningless unless you have sat in that car during that same time."