A flexible pet cage for use with an outdoor chair. The pet cage includes an upper wall, a forward wall, two sidewalls, and a rear wall that form an enclosure with an open bottom. The walls are comprised of a breathable, durable mesh material, and the pet cage is configured to reversibly attach to the outdoor chair and occupy a space thereunder. Upon reversibly attaching the pet cage to the outdoor chair, the pet cage may be used to house a pet therein, or may be folded up along with the outdoor chair for transport or storage.
