Veterinarian Ernie Ward put his passion for dogs where it really matters when he climbed into his parked car with a timer and a thermometer.

He recorded his reactions to the experience for a half hour, showing the rising temperatures every 10 minutes.

Once you’ve seen this video, you’ll never leave your dog in the car on a hot day with the windows cracked again.

Here’s another perspective with tips for what to do if you see a dog that has been left in a car:

If you see a dog left in a car on a warm day, consider some of the following actions:

• Carry a supply of simple “Don’t Leave Me in Here — It’s Hot!” flyers to leave on the car’s windshield. Red Rover has a variety of flyers that can be downloaded or purchased for this purpose.
• If the car is parked in a store parking lot, take down the license plate number, color, make and model of the car and ask the manager to make an announcement that the pet needs to be rescued from the hot car.
• Call animal control and report the situation to them.  Be sure to have the location, license plate number, color, make and model of the car ready before you call.