Can someone advise me on what best to use in a litter box? My new rabbit's taken to using her plastic pet carrier as a den, and is spending time resting in and sleeping in it. She's got a large den around it and is coming out to eat etc. When I collected her yesterday we put hay in the carrier for the journey but I haven't liked to change it yet as I want her to settle. There are no signs anywhere of urine so I'm assuming she's using the carrier as her litter box. Is this OK? If it is, I was thinking of putting a paper based litter in it with hay for her to nibble (she has hay elsewhere too). I'm concerned she'll get dirty from sitting in her wee - can anyone advise what's normal for them to do as I'm new to this. :?