Abstract: A removable moisture-resistant ball cover is provided. The ball cover substantially encloses a ball, such as a tennis ball, and includes an opening which can be expanded to attach the ball cover over the ball or remove the ball cover from the ball. The ball cover may be made from a silicone rubber material so as to be resistant to the absorption of liquid and also flexible enough to be easily attached and detached from the ball. The opening may be shaped in a variety of manners, such as a circular, crescent or oval, to permit the opening to be easily expanded to attach or detach the cover from the ball. The ball cover is sufficiently thin to maintain the functionality and usefulness of the dimensions of the ball but sufficiently thick to avoid being easily damaged by an animal which may chew on the ball with the ball cover.