What size dog door should I get?

Pet sizes – and pet door sizes – can seem confusing, because it’s relative to a person’s frame of reference. If a person is used to Rottweilers, a Beagle looks like a small dog. To a person used to teacup Yorkshire terriers, the Beagle is pretty big.

To make this more confusing, the right size pet door often looks small compared to the pet. Dogs tend to duck their heads and lift their feet when they go through, so the opening doesn’t have to be as tall as the pet. If you have larger and smaller pets together, the PlexiDor opens so easily that a smaller pet can generally use a larger pet door.

The weights in the list below are guidelines. If your pet is right on the spot you might need to measure him or her and compare with the opening size. Or, contact our customer service. They are experienced and happy to help.

PlexiDor size small

This pet door is small, and has a single pane design. The opening is 6.5 x 7 1/4 inches. It is suitable for cats up to 24 pounds and dogs up to 9 pounds. Common breeds are chihuahuas, papillons, yorkshire terriers, and pomeranians.

PlexiDor small

PlexiDor size medium

This dog door is intended for dogs up to 40 pounds. The opening is 9 x 12 inches, and common breeds are corgis, dachshunds, beagles, pekingese, cocker spaniels, shelties, and many terriers.

plexDior medium

PlexiDor size large

The large PlexiDor dog door has an opening of 11 3/4 x 16 inches, and it is intended for dogs up to 100 pounds. Common breeds are Labradors, Collies, German Shepherds, Dobermans, and Golden Retrievers.

PlexiDor large

PlexiDor size extra large

The extra large PlexiDor dog door has an opening of 16 x 23 3/4 inches and is intended for dogs up to 220 pounds. Larger dogs might be able to use it, depending on their build. Common breeds are Great Danes, Saint Bernards, Newfoundlands, Old English Sheepdogs, and Irish Wolfhounds.

PlexiDor extra large

More sizing help and information

You can download an overview of sizes – with opening sizes and needed cut holes – with examples of dog breeds and installation heights here.

And naturally, if you need help, contact customer service.

Choose the right pet door size

PlexiDor_through_glassMany find pet door sizing counter-intuitive. It’s easy to fall into the thought-trap that the dog door needs to be as tall as the dog is, and the right size can look small compared to the dog.

Remember that most dogs bow their head and lift their legs when they go through the door. This means the dog door can be shorter than the dog.

A correctly installed dog door is raised from the floor, making  a threshold for the dog to step over. Look at the image top right.

Why not make the door taller?

It might be an option for a family with fairly small pets. If you have a large dog, that would give an enormous hole in the door or wall. Besides being inefficient, a door panel the size of a Great Dane would be very heavy for the dog to open.

What if I have smaller and larger pets?

The PlexiDor dog doors are easy to open, and a smaller pet can generally open and use a larger door. You might have to adjust the height from the floor to find a position where the large dog doesn’t have to crouch to get through, and the smaller dog can still reach to get in and out.

PlexiDor dog doors come in sizes from small to extra large, and can accommodate everything from the smallest Chihuahua to an Irish Wolfhound.

Click here to download a size chart with recommended dog weights and dog door measurements. If you have any questions about door sizing, don’t hesitate to contact customer service. They have extensive experience and will help you find the best door for your pets.



Dog doors that stand up to even the largest dogs

In the past, owners of very large dogs  had problems finding suitable pet doors. Traditional flap doors can’t stand up to the power produced by a 200 lbs dog hitting it at a run. Countless owners  ended up with torn flaps, warped frames, and even pet door frames torn out of the household door.

PD extra largeThe PlexiDor dog door is specifically made to withstand even very large dogs. The frame is made from hardened aluminum that won’t crack or rust, and the panels are made from a special K9 Composite material. They’re thin, yet isolating, and strong enough to withstand the intense pounding a large dog can put them through. The PlexiDor factory has put an extensive amount of research into the material. The see-through panels also serves as a window for the pet.

An extra large dog also comes with extra strong jaws, and some breeds are known for chewing everything to pieces. The extra large PlexiDor dog door has an aluminum chew-proof trim around each panel, so even if the dog is bored and tries to take it out in the door, destroying the panel will not be easy.

Many pet owners worry about security, and that can seem a warranted concern when putting in a door large enough to accommodate a 220 lbs dog. Every PlexiDor dog door is delivered with a lock and key, and a steel security plate that attaches to the door frame.

The security plate screws on to the dog door frame, but for households that want to attach it often, be it for securing the house or for signaling to the dog that the door is locked, there is a sliding track accessory available. The security plate slides down the track to the right position, and is locked in place with a flip lock, so an intruder can’t get rid of it through pushing it up.

PlexiDor dog door with mounted sliding track and security plate. Extra Large.

The image to the right shows an extra large PlexiDor dog door with the security plate attached through the sliding track system. Note that you can lock and unlock the door through the security plate, so even if you forget to lock before putting the plate on, you don’t have to take it off again. The image also shows the security plate flip-lock on top.
There is also an awning available that provides shade and keeps rain and snow away.

The PlexiDor extra large dog door is available in three frame colors: silver, white, or bronze. The sliding tracks are available in the same colors, and awnings and security plates are either white or brone.

The extra large PlexiDor dog door is excellent for breeds such as Great Danes, Leonbergers, Newfoundlands, Rottweilers, St Bernards, Old English Sheepdogs, Irish Wolfhounds, and other dogs up to 220 lbs. The panels open so easily that a small and large pet can use the same door. However, if a smaller pet is to share the door it’s important to adjust the installation height so everyone can get in and out comfortably.

Find the right size pet door!

It is important to choose the right size pet door. It naturally has to be large enough to allow the pet easy access, but also as small as possible in order to keep rain, snow, and winds outside.

Most dogs duck their head and lift their legs when they go through a door, so the opening doesn’t have to be as tall as the dog. This can be confusing; it is tempting to install a pet door like we do a human door, with the opening starting at floor level. A dog door or cat door can generally be elevated.

The PlexiDor dog doors and cat door come in four convenient sizes to accommodate a wide range of pets and household needs. Click here to download a size chart as PDF!

Examples of breeds and door sizes are:

Cats up to 24 pounds and dogs up to 9 pounds, such as Chihuahuas, Pomeranians, Papillons, Yorkies, and Maltese generally require a small PlexiDor pet door.

Dogs up to 40 pounds, such as Poodles, Corgis, Dachshunds, Beagles, Pekingese, Shelties, Schnauzers, Cocker Spaniels, and many Terriers need a medium PlexiDor dog door.

Dogs up to 100 pounds, such as Labradors, German Shepherds, Golden Retrievers, Boxers, Collies, Setters, Bulldogs, Pointers, and Dobermans require a large PlexiDor dog door.

Dogs up to 220 pounds, such as Great Danes, St Bernards, Rottweilers, Old English Sheepdogs, Newfoundlands, Great Pyrenees, and Irish Wolfhounds need an extra large PlexiDor dog door.

The size chart contains recommendations for installation height from bottom of frame to floor. If you are concerned about the opening size, download this information sheet in PDF format with opening sizes and cut hole sizes for door units as well as wall units.

Frequently Asked PlexiDor Questions

PlexiDor Extra LargeIf you need a pet door, the PlexiDor is sturdy, secure, energy efficient, and comes with a five year warranty. Here are answers to some frequently asked questions.

Where can I install a PlexiDor?

The PlexiDor can be installed through a door, a wall, or even through glass. The part you see next to the doggie on the picture goes on the inside of the house.

The PlexiDor units for door installation fits a standard US house door of 1.75″ and the frame covers the cut-out edges of the house door.

PlexiDor dog door wall tunnelThe units for wall installation come with an aluminum wall tunnel that is adjustable from 4″ to 12″ On the image to the right, the door is seen from the outside of the house. The aluminum tunnel is angled to drain water and snow to the outside.

When it comes to installations in glass, every size door from the small one to the extra large and the electronic PlexiDor can be mounted in a sliding glass door, french style door, or window. To read more about this and to see installation photos, please follow this link.

What kinds of pets can use a PlexiDor?

The PlexiDor comes in several sizes to accommodate everything from cats to dogs weighing up to 200 lbs. The doors on the larger models swing so easily that smaller pets can use a bigger door.

If in doubt, check out the PlexiDor SizeChart.

The door looks so small. Will my dog really go through there?

If you have the right size according to the PlexiDor SizeChart, the answer is generally “Yes.” The door isn’t meant to be mounted flush with the floor; the pets lift their legs and walk/run over a threshold. The reason for this is that you want the opening to be as small as possible while still being big enough for your pet.

Looking at the chart above, the extra large PlexiDor, for example, should be mounted 12″-14″ up from the floor, unless a dog needs it to be lower.

Is it hard to teach a pet to use the door?

Pets generally catch on to the idea quickly. Prop the panels open and tempt your cat or dog with a treat. Once they go through with the panels open, try the same thing with panels closed. Many pets who won’t use other pet doors still like the PlexiDor because they can see the other side through the panel.

What warranties do you have?

The PlexiDor comes with an unconditional 90 day money back guarantee. Shipping charges are non refundable, but the factory will refund the purchase price in full.

The PlexiDor also comes with a 5 year warranty. Any defective part will be repaired or replaced, including standard shipping charges, for five years from the purchase date. Labor is not covered.

This warranty covers residential use. Commercial kennels should use the BiteGuard line of pet doors.

Do you have a door that will let my dog out but keep the cats inside?

We can’t guarantee that. The PlexiDor Electronic opens only for pets with a key, but cats are quick and can follow the dog outside.

How does the PlexiDor Electronic work?

It’s like a miniature garage door for pets. The pets allowed to use the door get collar keys with RFID. The keys are waterproof, shock proof, and do not require batteries.

When the key comes close to the door, the panel slides up. You can program how long the door will stay open, and since there are thousands of RFID codes you can feel confident the door will only open for your pets, even if other animals in the neighborhood have similar keys.