The only fully portable vehicle dog guard product on the market today! Thanks to our patented design, the WalkyGuard dog vehicle barrier solves all those unwanted problems associated with hard fixed system. It"s safe, easy to use and fits practically any vehicle, provided it is equipped with extendable rear headrests.Minimum size : 12inches high 34in wide. Maximum extension: 18in high 56in wide. Requires front-seat or rear-seat headrest for use (front-seat use also requires mesh barrier that must be purchased separately)