If you have a cage put a litter box (one that is post to be in a cage) and but Corn Cob litter not Wood Shavings cause that can make the rabbit sick..put alfa hay in the litter box to attract the rabbit to the litter box and he should start to use it...
I Have A Truck And Let My Dog Ride Back There All The Time then i heard how my friends dog jumped out so i got one of those truck bed Camper shells and now i let her still get back there but i bought this hook that screws into the bed that you hook ...