Doggie doors make it convenient for your pet to go in and out of the house. The simple flap design of most doggie doors makes it easy for your pet to open the flap. But over time, heat and cold can warp the flap material, and the flap no longer lies flush against the opening. This allows wind and weather into your home. It also gives access to insects, rodents and even larger wild animals that want shelter from the elements. Sealing your dog door when not in use is one way to protect your home.
Pull the pins holding the old flap in place with the pliers.
Remove the old flap from the dog door. The new flap must be 1-inch longer and wider than the old flap.
Unroll the magnetic tape. Lay the tape on the side and bottom edges of the flap. Cut pieces of tape to fit. Remove the adhesive backing, and adhere the strips to the flap.
Cut three more pieces of magnetic tape. Turn the magnets so that they are attracted to the installed magnets. Lay each magnet on its magnetic counterpart attached to the flap.
Put the new flap in place, and insert the pins.
Remove the backing from the magnets attracted to the magnets on the flap. Press the flap against the door. This adheres the magnets to the edges of the door in perfect alignment with the magnets on the flap.