Offering the same fold-down convenience features as the standard model the Side-Door option allows you to keep the cage in a living area without it being in an awkward position. It's become particularly popular with van owners. The door itself is strategically positioned on the longest side of the cage rather than on the short end. This ensures that the cage can be placed in areas with little or no depth and still operate the door without having to maneuver the cage. When space is limited the Side-Door model has unlimited appeal.