This is our 74 lb American Bulldog
With the black interior in the X showing all his short white hairs and the fibers in the carpet being such a low pile it's hard enough to vacuum when it's just me and my wife tracking it in and out of the car.
Her Rav4 has a much more open piled carpet on the floor, and it's gray interior so much more forgiving if it only gets cleaned out twice a month. We stick to bringing Chad places only in our car, the X gets driven less because of it but his white hairs on my all black interior would drive me mad.
We also bought a Kurgo Cover (google it) for her car that attached to the front and rear headrests. It ends up being a waterproof doggie hammock for the backseat so you don't have to fold the seats down. Chad loves it!