This is too horrible and makes me sick. What I'd like to do to people who take these beloved family members isn't suitable for a family Web site.
I used to take Ozzie

with me when he was a pup -- mostly to get him used to the car -- when I did quick "run-in" stops. That stopped when he was 2 or 3. If I have to leave him in the car alone -- and the car will not be in my visual range -- I don't take him.
I used to work for a newspaper. One of my early reporting jobs included picking up police reports each day. One day, there was a report of a woman who had left her 2 Yorkies in her car, locked. She came out to find the glass t-tops removed from her car and the dogs gone!
That was enough for me and that has been six or seven years ago.