This dog door is the ideal solution for giving your dog free access to indoor and outdoor areas while maintaining security and control in your home. The dog door is designed for larger dogs such as Labradors and German Shepherds. With its durable construction and robust materials, this dog door can withstand daily use and last for a long time. The Petmate Large Dog Door has a smart closing mechanism that allows you to control your dog's access to different areas. It can be locked to prevent unauthorized access or opened to allow your dog free movement. Installation of the dog door is simple and requires no special tools. It can be easily mounted in doors, walls or other suitable surfaces with the included mounting hardware.