Options two door dog puppy home innovative design incorporates unique heavy duty nylon clips for doors and ends which helps enable fast and simple assembly matching fully fitted tray no distortion during assembly accessories and mattresses available separately including new replacement trays available in 5 sizes small measures 56x45x51 medium measures 76x56x61 large measures 91x64x69 extra large measures 107x71x79 jumbo measures 121x74x81