Definatly a Harness!!
I learned first hand last fall just how dangerous it was to allow Kailee to ride unrestrained in the backseat of my car. Fortunatly she was not hurt, but she was thrown up into the front seat upon impact. Had the impact been any harder she may very well have hit the windshield or gone through it. As well, the thrust of her coming into the front seat was a contributing factor to my injuries being somewhat worse than they may have been. So definatly she is restrained, I only had to see the danger once.
Jean