A cage for an animal comprises a mesh top (21), mesh sides each having an upper part (23) and a lower part (24) and mesh ends (27, 28). The side parts (23, 24) are pivotally connected to the top and the sides (45) of a base frame and to each other. The ends (27, 28) are pivotally connected to the top (21) whereby the cage can be folded when not required for use by folding the ends (27, 28) up to the top (21) and then folding in the side parts (23, 24) so that the top rests on the base frame. The sides (45) of the base frame are provided with grooves (46) for receiving ribs (52) on the sides (53) of a tray (51) so that the tray can be slid into the base frame. One end (47) of the base frame is provided with a slot (49) to permit the tray to pass through it. The end (28) of the cage is provided with a door (41) and a carrying handle (60) is pivotally attached to the top (21). In use, the tray is removed, the cage is placed over an animal, and the tray is slid into place in the base frame to secure the animal in the cage.