In this case, run a tape measure from the floor just behind the front seats up to the ceiling. Otherwise, just measure the floor-to-ceiling height of the trunk area behind the back seats.
[header] How to build a dog barrier for your vehicle [title] Measure your vehicle's interior. [step] The size of your dog barrier will depend on the floor-to-ceiling and wall-to-wall lengths of your vehicle's trunk area. If your vehicle has collapsible back seats, you have the choice of placing the barrier just behind the front seats.