Caution: Leaving children, helpless adults, or pets in a vehicle with the windows closed is dangerous. They can be overcome by the extreme heat and suffer permanent injuries or even death from heat stroke. Never leave a child, a helpless adult, or a pet alone in a vehicle, especially with the windows closed in warm or hot weather.
Pets can be in the rear cargo area only if adequate ventilation is provided. With the roof, midgate, and endgate window closed, the rear cargo area of your XUV will have very little air movement, whether you are parked or moving. At a minimum, open the midgate window while driving, and the endgate window while parked, if you put a pet in the cargo area. Check periodically that the ventilation is adequate.