Do you think that Carlo scatters his poop around for a reason? because he does go in the tray, but he seems to need to poop all over the room as well
I sometimes sweep up with them in the room, do you think he is marking his pad?
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Certainly sounds like it but it is in my experience it's unusual behaviour for a neutered bun. Do you have any new air freshners in the house which could make everything seem different to him and hence unsettling him?