"It's a lousy way to die:" Veterinarian sits in parked car on hot summer day to prove how hot it gets

MILWAUKEE (WITI) -- Every summer -- you hear and read the warnings: Don't leave your dog (or your children, for that matter) in a hot car.

A veterinarian says he constantly warns dog owners about the dangers of leaving their pet in a hot car -- but he wanted to drive the point home in a visual way.

Dr. Ernie Ward decided to park his car on a hot summer day with all the windows cracked at least an inch.

He sat in the car for 30 excruciating minutes as the temperature climbed.

WATCH: