An Illinois veterinarian warning pet owners to avoid leaving dogs in a parked car for any length of time during the summer month. Dr. Valeri Farmer-Dougan, director of the Canine Behavior and Cognition Laboratory at Illinois State University, says even cooler temperatures could be dangerous.

She added that within 10-minutes of leaving an animal in a vehicle, the interior temperature could reach 140 degrees on hot days. In Illinois, leaving an animal in the car for a prolonged period is considered a misdemeanor and could come with a maximum one-year in jail sentence.