Research overview: litter and litter-box preferences in cats

Research has investigated what cats prefer in litter and litter boxes, with direct relevance to preventing house soiling. This overview surveys studies testing preferences for litter substrate, texture and scent, box size, depth of litter, cleanliness, covered versus uncovered designs, and number and placement of boxes. Findings generally indicate cats favour clean, larger, uncovered boxes with fine, unscented clumping substrate, and that frequent scooping and adequate box numbers reduce avoidance. The survey discusses how individual preferences vary and how mismatches contribute to elimination problems, as well as methodological approaches to measuring preference. It situates this work within the practical goal of designing toileting arrangements that suit cats' instincts, presenting evidence-based litter and box choices as a foundation for both good welfare and the prevention of one of the leading behaviour problems in pet cats.