This should not happen. We used dogs in Afghanistan and Iraq where it was much warmer. They had cooling vests, pre IV fluids, etc., to combat heat illnesses in dogs. There are measures that can be taken, but a caring eye is the most important tool.
Wow. I wonder how many feral dogs die of heat exhaustion. But then again, they are not overworked.
At least it wasn’t because he was left in the police cruiser....