It takes only minutes for a dog left in a vehicle on a warm day to succumb to heatstroke and suffocation. Most people don’t realize how hot it can get in a parked car on a balmy day. However, on a 78-degree day, temperatures in a car parked in the shade can exceed 90 degrees — and hit a scorching 160 degrees if parked in the sun (in 30 minutes or less)!