These doors are great, you will be very happy with these. Spring loaded hinge keeps door shut. When your dog is inside he pushes on it to come out, when your dog is outside and wants to go in, he pulls the door open with his nose (the side that opens is flared a lot). Sturdy aluminum non-rust door and galvanized door frame discourage chewing. Use louvered doors for air tight dog house. Scott louvered doors prevent moisture build up from your dogs breath, or, if the dog is wet. Louvered door ventilates in the summer, yet protects your dog from the elements of winter. A compliment to any dog house. Note: When facing the dog house opening offset to the right side of the dog house requires a right hand door. Opening offset to the left requires a left hand door. Solid doors can be used either way. Medium Louvered Kennel Door by T.E. Scott $33.95, 2/$61.90 Large Louvered Kennel Door by T.E. Scott $42.95, 2/$79.90 Small Solid Kennel Door by T.E. Scott $27.95, 2/$49.90 Medium Solid Kennel Door by T.E. Scott $29.95, 2/$53.90 Large Solid Kennel Door by T.E. Scott $35.95, 2/$65.90 Medium Dog Door Frame for Scott Dog House Doors $15.95, 2/$27.90 Large Dog Door Frame for Scott Dog House Doors $19.95, 2/$35.90 Replacement Springs for the Scott Kennel Doors $0.90, 20/$17.00