A pet toilet includes an outer and inner container. A lower outer sidewall portion having a lower sidewall provided on a sidewall of the outer container, and a lower inner sidewall portion having a lower sidewall provided on a sidewall of the inner container. The outer and inner containers are movable. A pet entrance that is lower than an adjacent sidewall formed by arranging the inner container into the outer container, such that the position of the lower outer sidewall portion matches the position of the lower inner sidewall portion. Further, the lower outer sidewall portion is closed by the sidewall of the inner container and the lower inner sidewall portion is closed by the sidewall of the outer container by arranging the inner container into the outer container, such that the position of the lower outer sidewall portion does not match the position of the lower inner sidewall portion.
