We've heard the excuses: "Oh, it will just be a few minutes while I go into the store,"or "But I cracked the windows..." These excuses don't amount to much if your pet becomes seriously ill or dies from being left in a vehicle.
This study also found that cracking the windows had very little effect on the temperature rise inside the vehicle. This is definitely a situation where "love 'em and leave 'em" is a good thing. Please leave your pets at home at home when you can...they'll be safe and happily waiting for you to come home.