PlexiDor Performance Pet Doors Wall Mount Dog & Cat Door, White, Small; The PlexiDor Performance Pet Doors Wall Mount Dog and Cat Door, Small is designed especially for your wee sidekick! This wall-mounted door can be installed in stud, brick, block or cement walls and features a high-quality fit and finish. The spring design on the K9 Composite panel lets even the smallest pups and kittens push the sliding door open with ease. It includes a high-density nylon weather seal to prevent heat or cool air from escaping your home. The spring-loaded lock can be set to four different positions to keep your pal inside, outside or to let her move in and out as she pleases. The durable aluminum frames are also scratch-resistant and are made to coordinate nicely with your home’s interior walls and appliances. It’s the paw-fect way to let your little pal explore and get exercise in the great outdoors!