SureFlap is known for making pet doors that actually think. This microchip model reads your pet’s existing ID chip or the included RFID collar tag. It only unlocks for animals you’ve programmed in. That means stray cats, raccoons, or your neighbor’s nosy dog stay outside. For multi-pet homes, the memory holds up to 32 animals. You set it once and forget it.

The door works best for large cats and small dogs. Your pet’s shoulders should be no wider than six inches to fit through comfortably. The frame is wood, so it installs into standard doors without looking like an afterthought. It runs on C batteries, which keeps it working even during a power outage. The unlocking mechanism is quiet and fast—your pet learns quickly that the door opens for them and only them.

One honest note: if you have a medium or large dog, this isn’t the right fit. The size is optimized for smaller animals. But for keeping a cat or small dog independent while keeping wildlife out, this is one of the most reliable options available.