Mathieu endured high temperatures in a PETA video. (YouTube: PETA)

Arizona Cardinals' free safety Tyrann Mathieu doesn't want dog owners to leave their dogs in their parked cars while they run their errands this summer. So, Mathieu decided to team up with PETA to show just how hot parked cars can get.

In a video that PETA released, Mathieu subjects himself to the extreme temperatures of a parked car in direct sunlight. Throughout the ordeal, Mathieu repeatedly fans himself to cool off, which ultimately proves ineffective.

By the fourth minute, the temperature has reached 105 degrees and Mathieu is seen wiping sweat off of his forehead.

"I seriously couldn't imagine leaving my dog in a car like this," Mathieu says in the video. "If you're going to make a dog a part of your family, then make him a part of your family."

By the sixth minute, the temperature has climbed to 113 degrees.

"I can't wait to get out of this car," he says.

He finally gets out after eight minutes and by then the temperature has soared to 120 degrees. Mathieu is drenched in sweat as he accepts a water bottle that is placed in his hand. It's worth noting that, as the video points out, dogs can't sweat like Mathieu is able to, so they can't cool themselves off in extreme temperatures.

You can watch the full video below, via PETA.