This is by far the easiest way to install an automatic doggie door in your home. The Automatic Electronic Pet Door installs in a sliding patio door. Your pet wears an ultrasonic collar that opens the door when it gets within a distance you set (1-10 feet). The door automatically closes and can be turned off or set so your pet can only enter or leave the house. A dual pane window goes above the door. And yes, you can still use your patio door and even lock it up with a deadbolt (to the pet door’s frame).
Door Buddy Door Latch to Dog Proof Litter Box. Easy Cat and Adult Entry into Room. Adjustable Strap. Replaces Need to Install Cat Doors or Put Up Pet Gates. Stop Dog from Eating Cat Poop Today! (Grey)