My bunny has been neutered since late June. He's currently 6 months. He does fine with going pee in his litter box, but I am a little concerned about his pooping habits. He goes in his litter box a lot, but even though he's neutered, he still is marking his pen all over. This is a problem because I want to convert him to free-roaming 100%, but I can't if he'll go all over my bedroom floor. Should I just continue sweeping it and putting it in his litter box? Or is there something else I should be doing?