Jippie seemed to have grown slightly bigger. Since he also has a splayed leg, he's not fitting into his litter box comfortably. After reading more articles on House Rabbit Society (I gradually print them every week), I do think a change is really needed. Jippie should have enough space when doing his business; I really don't want to know what the potential consequences would be of using a small litter box...
I removed the upper layer of his usual litter box and replace it with a sort of rack. A piece of rubber matting is then placed on top to prevent Jippie's legs falling into the gaps on the rack.
I cut a hole in a paper roll, stuck some hay into it and tied it to the green box. Jippie had been observing my activities as he ate his hay:
"What were you doing, hoomin?"
Jippie eventually sensed there was a change in his litter box. He hopped into the box to inspect his property:
"Oh, what is all this?"
So far, after his bathroom has seemingly been expanded, Jippie has not urinated outside the litter box! Previously, Jippie would urinate outside every single day ... and only once or twice in the litter box. You can see the stain on the tiles in the first photo.
Do you like the change, your majesty Prince Jippie? :)