The present invention is an improved whelping pen, formed from disposable materials and in a scored blank to have elongated side and end walls adapted to be folded to form the pen and to engage the side and end walls. The side and end walls are adapted to be covered by an elongated peaked roof engageable with said walls and adapted to support a drape to cover the interior elongated walls and floor and to be clamped to said walls in a temporarily secured manner for easy removal and disposal. Said wall and floor material impregnated with a moisture resistant chemical to prevent absorption of urine. One of said walls provided with an aperture to permit the mother to enter and leave the pen.