I went through the same thing the other day,We were at Tim Hortons having a coffee out on the bikes,we were parked beside an SUV,Inside was an old chocolate lab.The 4 windows were open just a crack,My husband was the one that noticed the dog in the car.He said to the owners why don't you let the dog out for some fresh air it is too hot for the animal to be in a car on days like we have been having.Adventually the owners got in and drove away.It just makes me sick,I never take my dogs anywhere on hot days like we have been having UNLESS,they are able to get out of the car.Honestly though leaving your windows down does nothing on hot summer days.

I leave all my windows down when the car is sitting in the drivway and i can barely stand getting in the car to go somewhere.Some people have no brains when it comes to animals.thank god for someone like you got that poor pup out of a life of misery.