The simple cat door strap will keep dogs out of room with litter box (if slightly larger than cat) while still allowing your cat to have easy access without having to use a bulky dog gate with cat door or carving a hole for an indoor pet door for cats. Dog proof cat feeder or keep dog out of litter box with this easy-to-use dog door latch.INSTALLS IN SECONDS AND IS EASY TO USE- Just peel and stick to the door and door frame using the strong 3M adhesive. The simple lock and unlock latch allows you to use it from either side of the door giving you quick and convenient access to the room in your house.ADJUSTABLE AND CUSTOMIZABLE- Use the adjuster on the strap to make the width of the door opening wider or narrower to work with the exact sizes of your cat and dog. You can even alter the position where you stick the plastic pieces to make it further customizable. Or, install on the back of the door to make it stronger, especially for larger and more persistent dogs. Compatible with all types of doors from Bi-fold doors to pocket doors and even double doorsHOW DOES IT WORK - Door latch for pets that allows an interior door to open just wide enough so cats can easily enter or exit, but at the same time keep it narrow enough so dogs (if slightly larger than cat) cannot get in so you can dog proof cat litter box or dog proof cat feeding station.