An animal containment pen particularly for use as a maternity pen for calfing cows includes a front panel, two side panels, and a rear gate. The front panel includes a head gate section adjacent one side panel and a squeeze panel pivotally mounted on the front panel and movable from a position alongside the front panel to a position squeezing the animal between the squeeze panel and the side panel adjacent the heat gate. A sliding gate is provided in the front panel between the squeeze panel and the opposite side. The squeeze panel and the head gate are directly mounted in the plane of the front panel so as to be formed therewith in an economic construction. The squeeze panel is mounted relative to the head gate so that movement of the squeeze panel to the squeezing position forces the head gate into a closed position to grasp the neck of the animal. The side panel against which the squeeze panel cooperates includes basically a flat sheet a lower rear part of which can be opened to allow access to the rear part of the animal. The squeeze panel can be automatically latched in place as it moves toward the side panel by a latch arrangement which cooperates with the side panel.