Experience the joy of independence for your pet with the PetSafe Never Rust Dog and Cat Door, a perfect choice among doggie doors for medium dogs. This revolutionary product, also suitable as doggie doors for small dogs, allows your furry companion to venture outside for their needs and playtime on their own terms, freeing you from the constant in-and-out routine. Tailored to fit your pet's size, this medium-sized dog doors are ideal for pets weighing up to 40 lb, featuring a flap opening of 8 1/8" W x 12 1/4" H. This pet door ensures your pet can pass through comfortably and safely without any struggle, providing a door that's just the right size for them. Gain control over your pet's access with the snap-on closing panel, a feature that makes this medium dog door practical and effective. This interior or exterior dog door lets you limit your pet's access when needed and keep stray animals from entering your home, maintaining your home's security and your pet's safety. Infuse a dash of style into your home with the paintable plastic frame of the PetSafe Never Rust Dog and Cat Door, a fashionable pet door. This pet door for both interior and exterior doors allows you to color-coordinate the pet door with your existing door, integrating it seamlessly into your home's decor. Relish the ease of DIY installation with this pet door, suitable for interior or exterior wood, PVC, metal, and paneled human doors between 1/16 inches and 2 inches thick.