For Cats Only: Pet doors can be easily attached to most door handles, securely fastening the door and protecting your cat's privacy from large animals! They can also withstand impacts from large pets. Easy to Install and Use: Installing the cat holder requires no tools or glue, and the door needs no adjustment. It will not ruin your paint or damage your house! Give your pet a private, independent space in just two steps: hang it on the door handle, then connect it to the door frame latch. Practical Design: The clever design allows you to easily open the door with one hand, whether you are tired inside or outside the room or carrying heavy objects, while preventing children from entering your cat's room. 5 Adjustable Sizes: Five functional openings allow the door holder to open for cats (2.5 inches to 6 inches), with an opening wide enough for a cat to easily enter, while a narrow opening prevents dogs and babies from passing through. You no longer need to confine your cat to a small cage, making it the perfect privacy solution for your feline friend.