I have a 4Knines hammock for the rear seat and a repurposed Mini Cooper rear bed storage area cover when I travel to keep the fur at bay. 2 Labs and 2 Curs, with the seats down the storage cover covers all.
This is my Jeep dog named Fenton! Great Dane, 5 years old, 175lbs. He seems to be enjoying the extra room of the JL over my previous Wranglers. Recently I took him on a week long Michigan road trip, the amount of sand that he managed to drag in the back was staggering! After that trip I threw the Canvasback cargo liner and a thick comforter back there.