I think I need to do this. I have large boxes and they still get pee on the wall cuz they stand to pee. I might see I'd dh can make a stand around it with plexiglass or somethingI've been playing around recently with the idea of a litter box inside of a litter box. This is what I currently have in my foster room:
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Helps to contain overshoots and excess digging but the inner pan is regular sized and so not too heavy.