Mikki car vent car window vent the safety dog window guard a car window vent for rectangular shaped car windows with both side and top grooves provides fresh air to animals who may need to be left in cars for a short period not suitable for very sloping windows the vent slots onto the glass and when the window is wound up fits into the top channel providing both ventilation for your pet and safety the ventilator expands and contracts leaving you to decide the amount of ventilation you requi