New PetSafe doggie door for up to 40 lbs (8" x 11" opening). Small enough that people can't get in. Has locking door on inside for extra safety. Telescoping strong aluminum frame (up to 2" door thickness). Extra door flap included ($35 value). Magnetically seals at base of door to keep weather out. New $100 cdn + $40 for extra door. https://www.amazon.c