A disposable absorbent cushion for use in pet carriers, crates, cages or other containers. The cushion features a liquid permeable outer layer and a super-absorbent inner layer, to keep the animal dry, even if it urinates. The cushion includes a rigid element which is cushioned and insulating. This rigid element, in the interior region of the cushion, keeps the cushion from bunching up, and provides a comfortable place for the animal to sit. The cushion also has a flexible peripheral region, which allows the cushion to be used in a variety of carriers with similar, but not identical, dimensions, and provides a comfortable nest-like effect.