Puppy in a car
Parking lot on sunny day
Owner needs training
(c) Hannah Six
A study by the Stanford University School of Medicine showed that temperatures inside cars can rise dramatically even on mild days. With outside temperatures as low as 72 degrees, researchers found that a car's interior temperature can heat up by an average of 40 degrees within an hour, with 80 percent of that increase in the first 30 minutes. A cracked window provides little relief from this oven effect. The Stanford researchers found that a cracked window had an insignificant effect on both the rate of heating and the final temperature after an hour.
(Source: King 5 - Seattle News)
P.S. No worries... Animal Protection soon arrived on the scene :)