Ruff Land Single Door Dog Kennel - Designed with straighter sides this kennel can fit through narrow doorways such as campers. Vent hole pattern displayed comes standard (1 3/8in) with two finger holes in the back. All kennel sizes except small are outfitted with composite doors. Ruff FLEX Technology StackRight Design SureVent Tapered Wall Design UpSide Raised Floor Interior 2-Way Door No Bite Grid Pattern Design Rattle-Free