Big Dog DoorŪ Weather Tight Chew Proof Indestructable Energy Efficient Easy To Install Fits Dogs To 200+ lbs. Includes: heavy duty spring hinges, 1/4" clear plexiglass and welded aluminum frame. 16 1/2" X 25 1/2" opening. Manufacturers 5 year warranty, includes chewing. Big Dog DoorŪ G-BIG$134.99 Optional Drop-in Closing Panel For The Big Dog DoorŪ ...Prevents Entry And ExitOptional Drop-in Closing Panel For The Big Dog DoorŪ ...Prevents Entry And Exit. To keep a pet from entering or leaving. The 1/4" polypropylene slides inside a double track aluminum channel. You can use the Drop-In Closing Panel on a door, shed, garage wall, etc. The Big Dog Door mounts on the outside and the Closing Panel mounts on the inside Optional Drop-in Closing Panel For The Big Dog DoorŪ ...Prevents Entry And Exit G-BIGCLOSE$39.99