1. Lets Cats In and Keeps Dogs Out - The Cat Door Prop is the easy, convenient, and secure way to keep the door cracked open for a cat to go in while keeping it narrow enough to keep dogs out of the room (if slightly larger than the cat). 2. Effortless to Use - Simply turn the knob or handle from either side to open the door and enter the room. Nothing needs to be manually latched or unlatched each time you enter. Relatching in the propped position is simple—just push or pull the door closed until the Door Latch Holder automatically engages with the door plunger. 3. Simple Installation, Non-Permanent - Remove the existing strike plate from the door jamb and replace it with the provided strike plate using the existing screws. The Door Holder for Cats requires no adhesives, cutting, or drilling, making it removable, reusable, and suitable for renters and travelers. Achieve a secure cat litter box area quickly. 4. Adjustable Width - The patented strike plate and door latch holder allow adjustment of the door opening between 3 and 5.5 inches, so you can set it based on your pets' sizes. Loosen the small screws, slide the pieces to the desired width, then tighten the screws securely to lock the position. A T8 Torx tool is included. 5. Strong and Pinch Free - Made from thick, high-quality materials for strength and durability, even with large or determined dogs. This pet door stopper remains stable when propped, helping prevent pinched fingers or tails and eliminating the risk of being locked in or out of rooms. 6. No Cut Cat Door - The adjustable door latch lock provides an interior door solution that gives cats access without the need for permanent modifications. Avoid complicated child locks or cutting a hole for a kitty door. There's no easier way to keep a door open or ajar for your cat. 7. Patented and Made in the USA - The Pet Door Prop is patented (#11591836), invented by pet owners, and made in the USA. Unlike cheaper, less durable imported alternatives, this design is built with high-quality materials and has been trusted by thousands of pet owners since 2015.