Abstract: A selectively deployable wheel assembly attachment for attaching to a conventional animal cage, often in pairs, to allow the cage to be rolled when desired without compromising the cage's general stability on a flat surface. The selectively deployable wheel assembly attachment includes a wheel assembly which includes a conventional wheel which is connected to an axle member and a fixed attachment mechanism which includes an attachment plate and an attachment elbow. In some embodiments, the selectively deployable wheel assembly attachment additionally includes an auxiliary support assembly which includes an adjustment plate and an adjustment loop for providing enhanced stability when the wheel assembly is in its deployed position.