A movable partition is usable with an animal kennel to change the size of the reposable region of the kennel within which an animal can be disposed during the animal's period of growth. The reposable region is situated between the kennel door and the movable partition. The movable partition is mountable to ventilation openings formed in the animal kennel and is movable among a variety of distances from the kennel door to change the size of the reposable region within the kennel in order to properly train the animal and to avoid the animal relieving itself within the kennel. The partition includes a barrier element and a number of mounting elements that are mountable to the ventilation openings of the kennel. The movable partition further includes a number of clip apparatuses that are cooperable with the mounting elements to retain the mounting elements mounted to the ventilation openings.