We bought a cover (very cheaply) and tried it, but the elastic was not the right size for our back seat. We bought an inexpensive thin blanket (from Christmas Tree Shop) and we just jam it into the crease between the back part and the bottom part of the seat (so that only the part Dexter lays on is covered). It works very well for us. The blanket is large enough so it covers the back seat of a small SUV with a little extra. Dex also doesn't move around much in the car so if Charlie moves a lot it may not work as well.