A pen for an animal, such as a dog, includes a plurality of walls and a frame. The plurality of walls can extend substantially vertically. The walls can include one or more wall panels. The wall panels can be transparent or highly translucent. The panels can be held in place at least in part by the frame, which can include a plurality of frame members and a plurality of connectors. The pen can include a door. A top frame member at the door can be movable to allow a person to freely enter and exit the space enclosed by the pen. The pen can provide confinement for an animal in a safe and aesthetically-pleasing manner. The pen can maximize an owner's ability to see his or her pet. The pen can provide the animal with clear visibility of its surroundings or owner, creating a lower stress environment for the pet.
