If you must leave the dog in the car for a few minutes, use window grills so the windows can be left open, park in the deepest shade you can find, put
a reflective space blanket over the windshield, and hot - foot it back to the car in less than 15 minutes.
The film would have to be
blanketed by a highly
reflective cover to endure the harsh conditions of deep
space and the heat near the destination star.