Does an indoor/outdoor cat that is not using the litter box have any specific behavioral issues that need to be addressed?

Yes, an indoor/outdoor cat that is not using the litter box may have specific behavioral issues that need to be addressed. This could be due to stress, territorial issues, medical problems, or a preference for eliminating outside. It is important to consult with a veterinarian or animal behaviorist to determine the underlying cause and develop a plan to address the issue.