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Sureflaps are dog or cat doors that unlock based on your pet's microchip so they can go through but other animals can't. No more raccoons or neighbors cats coming into your house.
You can also use them to allow one cat or small dog access to a room where food is available all the time, but keep the fat cats or dogs out.
If your pet doesn't have a microchip, there are tags you can get to go on their collars that will work.