The PetGear Window Vent Guard is the perfect way to make sure that your dog remains safely in the car without risk of them jumping out of the window. The Vent guard is very easy to fit and requires no tools! Dogs require proper ventilation in the car, as the sun is much stronger through the window and they can't reach for their own drink to cool down! Therefore the safety of winding down the window must be checked before you leave your car.