Abstract: A portable and disposable litter box includes a bottom tray, a top tray, and an insert. The insert includes insert sidewalls that are attached to the bottom tray. The litter box is configurable in open and closed states. In the closed state, the top tray is disposed on the bottom tray and a litter box cavity is defined between the bottom and top trays, and the insert sidewalls are pivoted inwardly such that the insert sidewalls are disposed in the litter box cavity. In the opened state, the top tray is pivoted away from the bottom tray, and the insert sidewalls are pivoted outwardly such that the insert sidewalls extend from the bottom tray to the top tray.