Booster Car Seat for Pets, Detachable Dog Car Seat with Safety Straps and Pockets, Pet Bed for Vehicle Travel for Small Medium Cats and Dogs. (Ballet, Medium) Ballet Medium is up for auction in Pet Supplies. The current bid is $2.50, 95% below the $54.99 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.