A: There are numerous methods for locking your house when using a pet door panel or cat door for sliding glass door:
When considering a pet patio panel, you first need to determine the kind of sliding glass door you have. You can easily install a patio pet panel door into both exposed and recessed doors. An exposed sliding glass door frame is visible and exposed in the interior and exterior wall. You can see the track the door slides into. A recessed frame is flush with or barely visible in the interior or exterior wall. You can't see the track the door slides into. If you have a recessed door, you will need a (not included) to install your pet door.
On top of those two options there is a group of pet doors for sliding doors that are neither a temporary install nor a semi-permanent install, but somewhere in between. That is, they may require tools to set up but are not fastened into your track.
Endura Flap Thermo Panel 3e Sliding Glass Dog Door - Pet Doors
Ideal Fast Fit Patio Panel Pet Door | Sliding Glass Door
This pet patio door is specially designed to fit the existing vinyl sliding patio door in your home. Enjoy ease of access without the hassle!If you're looking for a pet door for a sliding glass patio door, we have designed the absolute best sliding glass inserts that come as a self-contained unit ready to quickly drop into your aluminum or vinyl sliding glass patio door. We also feature our all new E-Glass, heavy duty, energy efficient patio panels with "Low-e" energy saving dual pane glass that provides superior thermal insulation helping to keep your home nice and cool in the summer and toasty warm in winter.Would you rather not cut holes in any walls or doors inside your house? Do you have a sliding glass door with aluminum frame leading out to the patio? Then the Fast Fit Pet Patio Door™ with all of its customizable options is right for you.Freedom Patio Panel Pet Doors allow your pet to come and go as he pleases through your sliding glass or screen door. These panels feature a heavy-duty aluminum construction and shatter-resistant, tempered safety glass. They’re also equipped with the energy-conserving UltraSeal flexible flap system designed to keep the heat and cold outdoors. Installation is easy, with no cutting required. You'll slide the panel into one end of your sliding door track, secure it to the frame, and add weather stripping. Open and close the other side of your door easily. If you ever need to move, you can easily remove the panel from the frame and take it with you.