Pet Door Glossary




The ability to re-arrange, remove, or add magnets to the flap or frame in order to change the strength of the seal. A stronger seal means the flap requires more force to push open, and is therefore more difficult for some pets to use. The ability to adjust the strength allows you to reduce the difficulty while your pet learns, and increase the difficulty as they are comfortable more maximum wind protection.

Found on only on the Thermo Panel 3e and Quick Panel 3. Refers to the bottom of the patio panel pet door being able to be altered by the customer to raise or lower the flap to best suit the pet.

Adjustable Step Over for Endura Thermo Panels for Sliding Glass Door Doggie Doors


These windows are attached using hinges, similar to a people door.

Casement Window | Option for Cat Door Insert Location

A locking bar typically used for sliding doors and windows. Generally they include a bracket that attaches to the wall jamb and an adjustable bar that when extended applies pressure to the back edge of the door/window. When secured, the bar prevents the door/window from being opened by blocking it. Very secure way of locking your sliding glass door when you have a pet door installed.

Charley Bar Used for Extra Security after a Doggy Door is Installed in a Sliding Glass Door

Lock that fits over the track behind the sliding door or window. Has a screw that is hand tightened when in place so that the door or window can not be opened as it would hit the lock.

Locks for Sliding Glass Doors included with Endura Flap Patio Panels for Pet Portals | Secure Patio Doors

The solid piece that slides over the pet door flap opening to close it off, preventing anything from going in or out.

Locking Covers Use to Cover A Dogy Door for Security | Security Cover for Dogie Door

There are various types of collar keys that are worn on a collar that triggers electronic, magnetic, motorized, and RFID pet doors to unlock or open.

Collar Key for Electronic Pet Inserts Worn on A Pet's Collar | Used to Open Electronic Pet Doors


Specifically made to be installed into interior and exterior swinging doors. Door mounted pet doors can be mounted in wood, fiberglass, metal, solid core, hollow core, paneled, and storm doors.

Doggie Door That Can Be Installed in People Doors | Garage Doors | Storm Doors | Paneled Doors

The total measurement of the your people door from inside to outside at the thickest part. Another way to look at it - how thick the material is that you will be cutting through to make the hole for the pet door.

Pet door that includes one flap on the interior frame and one on the exterior frame. Used for more extreme climates and to provide better insulation and energy efficiency.

Double Flap Dog Door Provides 2 Flaps For Extra Home Insulation and Energy Efficiency

Sash windows (up and down sliding) where both the upper and lower panels can slide.

A Draft Stopper weatherstrip seals up the gap between the overlap caused by the frames of a patio sliding door or window being offset with the addition of a pet door.

Strip That Goes on a Sliding Glass Door to Make Up for the Gap Cause by A Pet Insert


Less expensive pet door choices, may be more cost effective short-term, but do not offer superior energy efficiency or durability.

Electronic pet doors come in small cat sizes and sizes for larger pets. They typically require a battery in the collar key and the door. Ideal for keeping certain pets inside while others come and go, they also work as protection against raccoons and other unwanted animals. Some electronic dog and cat doors only control who enters, while others control who enters and who exits your home.

Electronic Pet Doors Will Only Let Designated Pets  Inside or Outside the Installed Area

Climates that have more severe weather, such as temperatures in the 100's or below freezing for long periods of time. Extremely windy areas can also fall under this classification, as you would want a pet door designed to withstand more intense weather conditions.


The moving part of the pet door that your dog or cat pushes through. It can be made of flexible material or rigid poly-carbonate types of material.

The Part that Swings on A Pet Door Where the dog Does Through | Flapper

The measurement of the flexible or rigid flap that the pet will be able to go through. Use this dimension when choosing a size for your pet!

Pet door flap that is made of a soft bendable material, such as vinyl.

Flap That Bends When The Pet Goes Through the Door | Generally More Comfortable to Use.

A small lock used for sliding door applications that is screwed to the back or trailing edge of the sliding door. A hole is drilled in the opposite frame and when the lock is engaged a pin from the lock goes into the drilled hole, preventing the door from being pulled open. These are usually at the bottom of the door, hence the name, as you use your foot to click a lever that inserts and pulls back the pin.

Locks for Sliding Glass Doors and Windows | Great to Use to Keep Your Home Secure After A Doggie Door Is Installed.

A feature primarily included with cat and small dog doors to control access to the door. There are four settings (hence the 4-way lock).

1) In only: allows your pet to come in at a certain time, and not go back out.

2) Out only: allows your pet to exit the door, but not come back in.

3) Locked: nothing can go in our out.

4) Unlocked: pets are free to go in and out as they please.

Some doors are able to be programmed with the settings on a timer and others you have to manually engage. On electronic doors, the 4-way lock usually overrides electronic settings.

Locking Options Available for Most Cat Doors | In-Only | Out-Only | Unlocked | Locked

Term used most often when putting a pet door for a door through a wall, it involves building a tunnel out of plywood, sheet metal, etc in order to seal up the rough cut out if no tunnel or liners are included with the pet door. Most pet doors today are considered "self-framing" and do not require you to frame out the hole yourself.


How well the pet door keeps out the outside elements, and saves on energy costs. A more insulating pet door will keep out the cold or hot air better than a less insulating pet door.

Refers to where you are going to put the pet door. Location options would be sliding door, door, wall, window, through glass, through screen door/screen enclosure, etc.


Generally these doors are very durable and can be installed in virtually any application. In most cases they will be a stripped down version of a door mount, containing only the flap frame and minimal hardware (if any). This allows the installer to mount the kennel door on any type of material by providing their own framing and hardware to suit the individual situation.

Doggy Doors Designed For Kennel Installation | Usually More Heavy Duty and Durable


The tunnel sections for smaller cat doors to be installed through walls. They generally add about 1-1/2 to 2" each to the cat door, depending on the model, and stack together for easy installation. You purchase enough to cover the depth of your wall.

Example: If the cat door can install in something up to 2" thick and each liner adds 2", and your wall is 7" thick, you will need to purchase 3 liners.

Pet Door (2") + Liner(2") + Liner(2") + Liner(2") = 8".

You then trim 1" off the third liner.

Tunnel Sections that Allow a Pet Door to be Installed in a Wall Instead of a Door

Short hand for low emissivity, it is a coating added to glass to increase energy efficiency. The coating helps to filter out sunlight.


Triggered with a collar key that is a small magnet, these doors require the collar key to pass very close to the bottom of the pet door. These need to be installed in such a way that when the pet passes through, the collar gets close enough to trigger the latch. There are some models that require batteries in the pet door and others that use only magnets.

Triggered off of the ID chip implanted by a vet or a collar key, these pet doors scan your pet in the same way vets and shelters use a scanner to identify your pet if they are found. The various models of microchip activated pet doors may control who comes in, who goes in and out, and control who comes in while protecting against determined intruders such as raccoons.

Motorized doors have a flap that will raise up for the pet so that they do not have to push anything as with traditional pet doors. The pet must be wearing a special "collar key" to trigger the pet door to open. Motorized pet doors are good for timid pets who might be intimidated by the pressure needed to push through a flap. However, they are not useful if you are trying to keep one pet in and let another in and out, as all the inside-only pet would have to do is follow out the one with the collar.


The measurement of the entire outside frame of the pet door, from left to right and top to bottom, outside edge to outside edge.

The Visible Outer Part of the Pet Door | Seen with Red Lines


They are typically installed into the same track as your sliding door, between the wall and slider. They can in some instances be installed on the stationary side by moving that glass over and placing the pet door between the stationary glass unit and the wall. Installing a patio panel will allow you to still use your sliding door, however you will lose space to walk through. There are patio panel pet doors to fit any type of slider, however some are more compatible than others.

Pet Portal Used For Sliding Glass Doors That Causes Little Damage to Door | Generally No Tools Required for Installation

Term for an interior or exterior door that swings on hinges. We use this term to distinguish between the pet door and the normal door that people use to limit confusion.

Attatched at the top or bottom of the sliding door. Involves screwing the lock catch to the slider and drilling a small hole into the opposite frame for the dead bolt to fit into.


A hard flap made of plexiglas, lexan, or another type of poly-carbonate. Mostly seen on smaller pet doors for cats. While rigid flaps are usually more durable than flexible ones, some pets prefer the softness of flexible flaps over rigid flaps.

Hard Flap For Pet Door That is More Chew Proof Than Regular Pet Flaps | Will Not Bend

This is the measurement of the physical hole that is cut through the door or wall during the installation of the pet door.


This is your typical up and down sliding window pet door panel. Similar to the fit of the patio panel pet doors you put the pet door into the window track and the sliding window closes on top of it.

Window That Slides Up and Down to Open and Close | Perfect For a Temporary Cat Door Insert!

Pet doors that install in your screened door, window or lanai. Screen mount pet doors can either secure to the screen frame, or be mounted with screen material on all four edges.

Doggie Portal that can Be Installed Into a Screen Door | Generally Installed in the Frame or in the Screen Mesh

Determines how thick the material can be for a pet door to fit through. A pet door will be self-framing up to this thickness, so if you wanted to install a pet door in material thicker than its self-framing range you would need to frame out the hole yourself. See definition of "frame out".

These are panel installations that will require cutting and/or drilling into your slider door/window tracks.

A custom option on Hale Pet Doors that allows you to slide in the closing cover from the left or the right side. Used primarily for through wall installations where there is a window above the install location that would block a top-loading cover.

Pet door that includes only one flap; depending on the model the one flap can be located on either the inside or outside frame of the door.

Pet Door with Just One Flap | Perfect for Mild Weather Conditions | Easier for Pet to Push Through

The distance between the ground and the bottom of the flap; you can think of it as the height that your pet will have to step over to get through their pet door. A lower step over is recommended so that when your pet ages or suffers from injury, they will not have to struggle over a high step over. The Thermo Panel 3e actually has a user-adjustable step over feature so the flap can be changed to best suit your pet.

The Height of the Pet Opening that the Pet Must Stepover to Reach the Other Side | Try to Keep this as Low as Possible

General term for a door that is on the exterior of a house in front of a people door. Storm doors can be made of glass, screen, plexiglas, and metal and are normally thinner than a standard interior/exterior door.

Storm Door is Usually Much Thinner Than Regular Doors | STorm Door with Doggie Door


Refers to a sliding door/window or sash installation which requires no drilling or cutting in order to secure the pet door. The pet door can be easily removed if necessary, and leaves no damage to your home. For example, check out one of our vinyl pet door for sliding glass doors.

There are two types of through glass doors. The first is what would be considered a regular door mount type of pet door that has the ability to be installed through really thin materials. The second is an entire glass unit with a pet door that is already installed through it that replaces your current glass. In both cases we recommend hiring a professional local glass company to advise you on the installation.

Pet Door Installed In the Glass of a Sliding Glass Door, Window, French Doors, or Storm Doors

With the sliding door open this is the measurement of the track of your slider from the deepest part in the bottom of the track to the deepest part up inside of the top track.

This is the measurement of the track the sliding glass door/window slides in from the inside of the house to the outside. Usually this dimension ranges between 1"-2.5".

Frames out the interior of the rough cut out for wall mount pet doors.


Wall mounts are made to fit through interior or exterior walls. The kits will either include a tunnel to frame out the interior of the wall or will have liners you can purchase separately. There are many different models of pet doors for walls depending on the size of pet and the total wall thickness you will need to frame out.

Pet Flap designed to be Installed in Walls | Enduro Flap Installed in a Paneled Wall

The total measurement of the wall from the interior to exterior including any siding. In other words, how thick the material is that you will be cutting through to create the hole for your pet door.

Strips of vinyl or foam that are installed with a pet door in order to prevent drafts and help seal against the elements. Weather stripping goes around the edges of the pet door to seal any small gaps between the frame and your home.

Weather Stripping Installed on the SIde of a Pet Insert in Sliding Glass Doors for a Better Seal and Insulation Value