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Dragon Double Flap Pet Door for Sash Windows

A close-up of a white Dragon brand double flap pet door insert for aluminum sash windows, slightly tilted open.
A front view of a black Dragon brand double flap pet door insert for aluminum sash windows, closed.
A front view of a black Dragon brand double flap pet door insert for aluminum sash windows, closed.
A close-up of a black Dragon brand double flap pet door insert for aluminum sash windows, closed.
A close-up of a black Dragon brand double flap pet door insert for aluminum sash windows, slightly tilted open.
A front view of a black Dragon brand double flap pet door insert for aluminum sash windows, tilted open, with a dog walking through.
 A close-up of a black Dragon brand double flap pet door insert for aluminum sash windows, tilted open, with a cat walking through.
A close-up of a black Dragon brand double flap pet door insert for aluminum sash windows, showing the double flap design.
A front view of a black Dragon brand double flap pet door insert for aluminum sash windows, installed in a window.
A front view of a white Dragon brand double flap pet door insert for aluminum sash windows, closed.
A front view of a white Dragon brand double flap pet door insert for aluminum sash windows, closed.
A close-up of a white Dragon brand double flap pet door insert for aluminum sash windows, slightly tilted open.
A zoomed-in front view of a white Dragon brand double flap pet door insert for aluminum sash windows, slightly tilted open.
A close-up of a black Dragon brand double flap pet door insert for aluminum sash windows, slightly tilted open.
A front view of a black Dragon brand double flap pet door insert for aluminum sash windows, slightly tilted open.
A zoomed-in front view of a black Dragon brand double flap pet door insert for aluminum sash windows, slightly tilted open.
A front view of a black Dragon brand double flap pet door insert for aluminum sash windows, closed.
A front view of a white Dragon brand double flap pet door insert for aluminum sash windows, closed.
A front view of a white Dragon brand double flap pet door insert for aluminum sash windows, closed.
A close-up of a white Dragon brand double flap pet door insert for aluminum sash windows, closed.
A close-up of a white Dragon brand double flap pet door insert for aluminum sash windows, slightly tilted open
A front view of a black Dragon brand double flap pet door insert for aluminum sash windows, closed.
A front view of a black Dragon brand double flap pet door insert for aluminum sash windows
A close-up of a black Dragon brand double flap pet door insert for aluminum sash windows, slightly tilted open.
A close-up of a black Dragon brand double flap pet door insert for aluminum sash windows
A close-up of a white Dragon brand double flap pet door insert for aluminum fixed sash windows
A front view of a white Dragon brand double flap pet door insert for aluminum fixed sash windows, closed.
A front view of a white Dragon brand double flap pet door insert for aluminum fixed sash windows
A close-up of a white Dragon brand double flap pet door insert for aluminum fixed sash windows, slightly tilted open.
A front view of a black Dragon brand double flap pet door insert for aluminum fixed sash windows.
A front view of a black Dragon brand double flap pet door insert for aluminum fixed sash windows, closed.
A close-up of a black Dragon brand double flap pet door insert for aluminum fixed sash windows, slightly tilted open.
A close-up of a black Dragon brand double flap pet door insert for aluminum fixed sash windows, slightly tilted open.
A front view of a white Dragon brand double flap pet door insert for aluminum egress sash windows, closed.
A front view of a white Dragon brand double flap pet door insert for aluminum egress sash windows, closed.
A close-up of a white Dragon brand double flap pet door insert for aluminum egress sash windows, slightly tilted open.
A close-up of a white Dragon brand double flap pet door insert for aluminum egress sash windows, slightly tilted open.
A front view of a black Dragon brand double flap pet door insert for aluminum egress sash windows, closed.
A front view of a black Dragon brand double flap pet door insert for aluminum egress sash windows, closed.
A close-up of a black Dragon brand double flap pet door insert for aluminum egress sash windows, slightly tilted open.
A close-up of a black Dragon brand double flap pet door insert for aluminum egress sash windows, slightly tilted open.
A front view of a white Dragon brand double flap pet door insert for aluminum double-hung sash windows, closed.
A front view of a white Dragon brand double flap pet door insert for aluminum double-hung sash windows, closed.
 A close-up of a white Dragon brand double flap pet door insert for aluminum double-hung sash windows, slightly tilted open.
A close-up of a white Dragon brand double flap pet door insert for aluminum double-hung sash windows
A front view of a black Dragon brand double flap pet door insert for aluminum double-hung sash windows, closed.
A front view of a black Dragon brand double flap pet door insert for aluminum double-hung sash windows
A close-up of a black Dragon brand double flap pet door insert for aluminum double-hung sash windows, slightly tilted open.
A close-up of a black Dragon brand double flap pet door insert for aluminum double-hung sash windows, slightly tilted open.
A front view of a white Dragon brand double flap pet door insert for aluminum casement sash windows, closed.
A front view of a white Dragon brand double flap pet door insert for aluminum casement sash windows, closed, with the locking cover in place.
A close-up of a white Dragon brand double flap pet door insert for aluminum casement sash windows, slightly tilted open, with the locking cover in place.
A close-up of a white Dragon brand double flap pet door insert for aluminum casement sash windows, slightly tilted open, with the locking cover removed.
A front view of a black Dragon brand double flap pet door insert for aluminum casement sash windows, closed, with the locking cover in place.
A front view of a black Dragon brand double flap pet door insert for aluminum casement sash windows, closed, with the locking cover removed.
A close-up of a black Dragon brand double flap pet door insert for aluminum casement sash windows, slightly tilted open, with the locking cover in place.
A close-up of a black Dragon brand double flap pet door insert for aluminum casement sash windows, slightly tilted open, with the locking cover removed.
A close-up of a white Dragon brand double flap pet door insert for aluminum basement sash windows, slightly tilted open, with the locking cover removed.
A front view of a white Dragon brand double flap pet door insert for aluminum basement sash windows, closed, with the locking cover in place.
A front view of a white Dragon brand double flap pet door insert for aluminum basement sash windows, closed, with the locking cover removed.
A close-up of a white Dragon brand double flap pet door insert for aluminum basement sash windows, slightly tilted open.
 A front view of a black Dragon brand double flap pet door insert for aluminum basement sash windows, closed.
A front view of a black Dragon brand double flap pet door insert for aluminum basement sash windows, closed, with the locking cover in place.
A close-up of a black Dragon brand double flap pet door insert for aluminum basement sash windows, slightly tilted open, with the locking cover in place.
A close-up of a black Dragon brand double flap pet door insert for aluminum basement sash windows, slightly tilted open, with the locking cover removed.
A close-up of a white Dragon brand double flap pet door insert for aluminum horizontal sash windows, slightly tilted open, with the locking cover removed.
A front view of a white Dragon brand double flap pet door insert for aluminum horizontal sash windows, closed.
A front view of a white Dragon brand double flap pet door insert for aluminum horizontal sash windows, closed, with the locking cover in place.
A close-up of a white Dragon brand double flap pet door insert for aluminum horizontal sash windows, slightly tilted open, with the locking cover in place.
A front view of a black Dragon brand double flap pet door insert for aluminum horizontal sash windows, closed.
A front view of a black Dragon brand double flap pet door insert for aluminum horizontal sash windows, closed, with the locking cover in place.
A close-up of a black Dragon brand double flap pet door insert for aluminum horizontal sash windows, slightly tilted open, with the locking cover in place.
A close-up of a black Dragon brand double flap pet door insert for aluminum horizontal sash windows, slightly tilted open, with the locking cover removed.
A front view of a white Dragon brand double flap pet door insert for aluminum garden sash windows, closed.
A front view of a white Dragon brand double flap pet door insert for aluminum garden sash windows, closed, with the locking cover in place.
A close-up of a white Dragon brand double flap pet door insert for aluminum garden sash windows, slightly tilted open.
A close-up of a white Dragon brand double flap pet door insert for aluminum garden sash windows, slightly tilted open, with the locking cover in place.
A front view of a black Dragon brand double flap pet door insert for aluminum garden sash windows, closed.
A front view of a black Dragon brand double flap pet door insert for aluminum garden sash windows, closed, with the locking cover in place.
A close-up of a black Dragon brand double flap pet door insert for aluminum garden sash windows, slightly tilted open, with the locking cover in place.
Black Dragon double flap pet door insert for aluminum sash windows, front view, closed. Adjustable to fit windows 22"-43" wide.
White Dragon double flap pet door insert for aluminum sash windows, front view, closed. Made with durable aluminum framing and UV-resistant additives.
White Dragon double flap pet door insert for aluminum sash windows, front view, with locking cover. Locking cover for added security when needed.
White Dragon double flap pet door insert for aluminum sash windows, front view with locking cover, slightly open. Easy installation with spring-loaded mechanism.
White Dragon double flap pet door insert for aluminum sash windows, front view with locking cover, open. Flexible, translucent flap allows easy access for pets of all sizes.
Black Dragon double flap pet door insert for aluminum sash windows, front view with locking cover, slightly open. Double flap design maximizes energy efficiency and weather resistance.
Black Dragon double flap pet door insert for aluminum sash windows, front view with locking cover, open. Fits window tracks at least 1" thick for secure fit.
Black Dragon double flap pet door insert for aluminum sash windows, front view with locking cover, slightly open. Top-loading locking cover restricts pet access and adds security when needed.
Black Dragon double flap pet door insert for aluminum sash windows, front view with locking cover, open. Available in seven width adjustment ranges to fit windows 22"-43" wide.
White Dragon double flap pet door insert for aluminum sash windows, front view, closed. Ideal for renters or vacation homes.
White Dragon double flap pet door insert for aluminum sash windows, front view, closed, with locking cover. Includes sturdy, black, top-loading locking cover.
White Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Adjustable width ranges to fit windows 22"-43" wide.
White Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Double flap design maximizes energy efficiency and weather resistance.
Black Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Sturdy aluminum framing available in black or white, with UV-resistant additives for durability.
Black Dragon double flap pet door insert for aluminum sash windows, front view, closed, with locking cover. Easy installation with spring-loaded mechanism.
Black Dragon double flap pet door insert for aluminum sash windows, front view, closed, with locking cover. Fits window tracks at least 1" thick for secure fit.
White Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Translucent, flexible flap allows easy access for pets of all sizes.
Black Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Ideal for renters or vacation homes.
White Dragon double flap pet door insert for aluminum sash windows, front view, closed. Designed for sash windows.
White Dragon double flap pet door insert for aluminum sash windows, front view, closed, with locking cover. Top-loading locking cover restricts pet access and adds security when needed.
White Dragon double flap pet door insert for aluminum sash windows, front view, tilted. Adjustable width ranges to fit windows 22"-43" wide.
White Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Double flap design maximizes energy efficiency and weather resistance.
Black Dragon double flap pet door insert for aluminum sash windows, front view, closed. Sturdy aluminum framing available in black or white, with UV-resistant additives for durability.
Black Dragon double flap pet door insert for aluminum sash windows, front view, closed, with locking cover. Easy installation with spring-loaded mechanism.
Black Dragon double flap pet door insert for aluminum sash windows, front view, tilted. Translucent, flexible flap allows easy access for pets of all sizes.
Black Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Ideal for renters or vacation homes.
White Dragon double flap pet door insert for aluminum sash windows, front view, closed. Designed for sash windows.
White Dragon double flap pet door insert for aluminum sash windows, front view, closed, with locking cover. Top-loading locking cover restricts pet access and adds security when needed.
White Dragon double flap pet door insert for aluminum sash windows, front view, tilted. Available in seven width adjustment ranges to fit windows 22"-43" wide.
White Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Fits window tracks at least 1" thick for secure fit.
Black Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Sturdy aluminum framing available in black or white, with UV-resistant additives for durability.
Black Dragon double flap pet door insert for aluminum sash windows, front view, closed, with locking cover. Easy installation with spring-loaded mechanism.
Black Dragon double flap pet door insert for aluminum sash windows, front view, tilted. Translucent, flexible flap allows easy access for pets of all sizes.
White Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Double flap design maximizes energy efficiency and weather resistance.
Black Dragon double flap pet door insert for aluminum sash windows, front view, closed, with locking cover. Designed for sash windows.
White Dragon double flap pet door insert for aluminum sash windows, front view, closed. Adjustable width ranges to fit windows 22"-43" wide.
Black Dragon double flap pet door insert for aluminum sash windows, front view, tilted, with locking cover. Ideal for renters or vacation homes.
Black Dragon double flap pet door insert for aluminum sash windows, front view, closed, with locking cover. Fits window tracks at least 1" thick for secure fit.
Black Dragon double flap pet door insert for aluminum sash windows, front view, tilted. Top-loading locking cover restricts pet access and adds security when needed.
White Dragon double flap pet door insert for aluminum sash windows, front view, closed. Available in seven width adjustment ranges to fit windows 22"-43" wide.
Black Dragon double flap pet door insert for sash windows, front view, closed. Sturdy aluminum framing available in black or white, with UV-resistant additives for durability.
White Dragon double flap pet door insert for sash windows, front view, closed. Adjustable width ranges to fit windows 22"-43" wide.
Black Dragon double flap pet door insert for sash windows, front view, closed, with locking cover. Easy installation with spring-loaded mechanism.
White Dragon double flap pet door insert for sash windows, front view, closed. Designed for sash windows.
Black Dragon double flap pet door insert for sash windows, front view, closed, with locking cover. Ideal for renters or vacation homes.
White Dragon double flap pet door insert for sash windows, front view, closed. Top-loading locking cover restricts pet access and adds security when needed.
Black Dragon double flap pet door insert for sash windows, front view, closed. Fits window tracks at least 1" thick for secure fit.
White Dragon double flap pet door insert for sash windows, front view, closed. Translucent, flexible flap allows easy access for pets of all sizes.
Black Dragon double flap pet door insert for sash windows, front view, closed. Double flap system maximizes energy efficiency and weather resistance.
White Dragon double flap pet door insert for sash windows, front view, closed. Available in seven width adjustment ranges to fit windows 22"-43" wide.
Black Dragon double flap pet door insert for sash windows, front view, angled. Translucent, flexible flap allows easy access for pets of all sizes.
White Dragon double flap pet door insert for sash windows, front view, angled. Double flap system maximizes energy efficiency and weather resistance.
Black Dragon double flap pet door insert for sash windows, front view, angled, with locking cover. Easy installation with spring-loaded mechanism.
White Dragon double flap pet door insert for sash windows, front view, angled. Designed for sash windows.
Black Dragon double flap pet door insert for sash windows, front view, angled, with locking cover. Ideal for renters or vacation homes.
White Dragon double flap pet door insert for sash windows, front view, angled. Top-loading locking cover restricts pet access and adds security when needed.
Black Dragon double flap pet door insert for sash windows, front view, angled. Fits window tracks at least 1" thick for secure fit.
White Dragon double flap pet door insert for sash windows, front view, angled. Sturdy aluminum framing available in black or white, with UV-resistant additives for durability.
Black Dragon double flap pet door insert for sash windows, front view, angled, with locking cover. Adjustable width ranges to fit windows 22"-43" wide.
White Dragon double flap pet door insert for sash windows, front view, angled. Available in seven width adjustment ranges to fit windows 22"-43" wide.
White Dragon double flap pet door insert for sash windows, front view, angled. Translucent, flexible flap for easy access for pets of all sizes.
White Dragon double flap pet door insert for sash windows, front view, angled. Double flap system maximizes energy efficiency and weather resistance.
White Dragon double flap pet door insert for sash windows, front view, angled, with locking cover. Easy installation with spring-loaded mechanism.
Black Dragon double flap pet door insert for sash windows, front view, angled. Adjustable width ranges to fit windows 22"-43" wide.
Black Dragon double flap pet door insert for sash windows, front view, angled, with locking cover. Ideal for renters or vacation homes.
Black Dragon double flap pet door insert for sash windows, front view, angled. Top-loading locking cover restricts pet access and adds security when needed.
Black Dragon double flap pet door insert for sash windows, front view, angled. Fits window tracks at least 1" thick for secure fit.
White Dragon double flap pet door insert for sash windows, front view, angled. Sturdy aluminum framing available in black or white, with UV-resistant additives for durability.
White Dragon double flap pet door insert for sash windows, front view, angled, with locking cover. Available in seven width adjustment ranges to fit windows 22"-43" wide.
White Dragon double flap pet door insert for sash windows, front view, angled. Sash window pet door with double flap design for improved sealing and insulation.
White Dragon double flap pet door insert for sash windows, front view. Sash window pet door with double flap design for improved sealing and insulation.
Black Dragon double flap pet door insert for sash windows, front view, angled. Adjustable width ranges to fit windows 22"-43" wide.
Black Dragon double flap pet door insert for sash windows, front view, angled, with locking cover. Ideal for renters or vacation homes.
Black Dragon double flap pet door insert for sash windows, front view, angled, with locking cover. Top-loading locking cover restricts pet access and adds security when needed.
Black Dragon double flap pet door insert for sash windows, front view, angled. Sturdy aluminum framing available in black or white, with UV-resistant additives for durability.

Dragon Double Flap Pet Door for Sash Windows

Regular price
$279.99
Sale price
$279.99
Regular price
Sold out
Unit price
per 
White
Black

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  • Double Flap Design: Improved sealing and insulation for sash windows, perfect for winter climates
  • Sturdy Aluminum Frame: Available in black or white, with UV-resistant additives for lasting durability
  • Adjustable Width: Accommodates windows 22" - 43" wide, suitable for various window sizes and types
  • Locking Cover Included: Added security with a top-loading locking cover to restrict pet access when needed
  • Effortless Installation: Simple, spring-loaded mechanism for quick and easy installation without cutting into your door or wall
  • Custom orders are made to your specifications and are non-returnable
  • Approximately one month to build your custom pet door; reach out to our customer service team for expedited shipping options
  • Panels less than 22" will have no glass 

Product Details


The Dragon Double Flap Pet Door for Sash Windows offers a flexible, translucent flap that combines with a double flap design, making it suitable for dogs and cats of all sizes while ensuring optimal weather resistance.

The Dragon Pet Door is designed for sash windows and is adjustable to fit windows from 22" to 43" wide. The easy installation process is a breeze, thanks to the spring-loaded mechanism that securely fits into your window track. The aluminum framing, available in black or white, is not only durable but also features UV-resistant additives to prevent warping and cracking.

The double flap system not only maximizes energy efficiency but also provides an extra layer of protection against cold weather. This pet door is perfect for renters or those who prefer a non-invasive installation, as it doesn't require any holes to be cut into your door or wall. Your pets will love the freedom to come and go as they please.

Safety and security are paramount, which is why the Dragon Sash Window Pet Door includes a top-loading locking cover that can be used to restrict pet access and deter intruders. The locking cover slides into the interior frame for added peace of mind.

Don't need two flaps? For mild climates, check out the Dragon Single Flap Pet Door For Sash Windows.

Features:

  • Translucent, Flexible Flap: Allows easy access for pets of all sizes and ensures optimal weather resistance
  • Energy-Efficient Double Flap System: Maximizes insulation and protection against cold weather
  • Non-Invasive Installation: Ideal for renters or vacation homes, with no need to cut into doors or walls
  • Aluminum Frame: Designed to fit window tracks at least 1" thick for a secure and stable fit
  • Top-Loading Locking Cover: Provides added security and restricts pet access when necessary

Benefits:

  • Window doggie door allows pets the independence to come and go as they please 
  • Simple, quick installation, easily removable; ideal for renters or vacation homes
  • Flexible flap is safe and comfortable for dogs and cats to use

Size Chart

Flap Dimensions:

5 3/8"w x 7 1/16"h

The entry way your dog goes through.
flap dimensions
Height To Raise Window

Height To Raise Window

15 7/16"

How high you must raise your window in order to fit the panel into the track.

Flap Dimensions:

7 1/16"w x 13 1/16”h

The entry way your dog goes through.
flap dimensions
Height To Raise Window

Height To Raise Window

21 5/8"

How high you must raise your window in order to fit the panel into the track.

Flap Dimensions:

9 3/8"w x 16 9/16"h

The entry way your dog goes through.
flap dimensions
Height To Raise Window

Height To Raise Window

25 5/16"

How high you must raise your window in order to fit the panel into the track.
Flap SizeFlap DimensionsStep OverHeight to Raise WindowRecommended Pet Height*
Small5 3/8"w x 7 1/16"h3"15 7/16"9" - 12"
Medium7 1/16"w x 13 1/16"h3"21 5/8"11" - 16"
Large9 3/8"w x 16 9/16"h3"25 5/16"11" - 22"

 

*measured from the ground to the tallest point of their back.

IMPORTANT SIZING INFORMATION

The Dragon Pet Door’s two-piece flap is designed to tear away for your pet’s safety. If you pet door is not the right size for your pet, they may break off flap during normal use. Follow these sizing tips to help ensure that you are buying the right Dragon Pet Door size:

  • Check the Flap Height: You must measure your dog before purchasing a pet door. A large dog may not fit in a “large” pet door. The tallest point of your dog’s back should be at least 1” beneath the top of the flap. 
  • Check the Step-Over: Your pet should be able to over the bottom of the flap comfortably. If the distance from the floor to the bottom of the pet door (called the stepover) is too high, your dog’s paw may catch in the pet door’s U-gasket. It’s better to have a taller pet door that is lower to the ground than a smaller pet door that is too high up.
  • Check Your Entry/Exit Level: The inside of your home may be higher than the ground outside. This means that your door may have different step-over heights depending on whether you are indoors or outdoors. Try to use the lower level when picking your step over height. You can also even of the different levels with a ramp or platform. 
  • Reinforce Your Flap: Every Dragon Pet Door comes with instructions for how to reinforce the screws keeping your flap in place. If you are worried in any way that your pet may rip off the flap, we recommend preemptively reinforcing your flap. Note that doing so will negate the teat-away safety feature. 

If you have any questions about which size pet door your pet needs, please contact our team of pet door experts for guidance and recommendations. 

Find The Best Pet Door Size For My Pet

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Pet Height: inches

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Pet Width: inches

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Installation Instructions

installation video image
Installation icon Difficulty Easy
Installation icon Steps 04
Installation icon Time Required 0.5 hours
Installation icon Sections 03
Installation icon Flags 01

Parts

  • 1 Sash Window Insert with a Pre-Installed Single Flap Dragon Pet Door
  • 1 Foam Weather Strip
  • 1 Locking Cover

Tools

  • Flathead Screwdriver

Please read instructions & notes thoroughly before installation.

Step 1 Release Spring Mechanism

  • Loosen the width adjustment locks at the end of the sash with a screwdriver. This allows the spring mechanism to move freely from side to side.
  • Watch out, it might jump at you the first time.

Step 2 Test Fit in Window Track

  • Before applying weatherstripping, insert the sash into the window track to test he fit.
  • Push into the spring mechanism and swing the opposite end into the opposite window track. Gently release then tighten the width adjustment locks.
  • Ensure that the pet door sits correctly in the window. See the FAQ for guidance if the sash does not quite fit.

Step 3 Apply Weather-Stripping

  • Once you have confirmed the sash fits, loosen the width adjustment locks and remove it from the frame.
  • Apply the foam weatherstripping by peeling back the paper and exposing the adhesive. Unroll it along the edge of the sash, pressing to ensure it adheres.
  • Use scissors to trim the strip to fit the length of your sash. Apply to both the top and the bottom.

Step 4 Lock Into Track

  • Place the sash back into the window, then tighten the width adjustment locks to lock it in place.

LOCKING YOUR WINDOW

For a temporary lock, place a removable wooden dowel or charley bar in either track above the window, shown here. For a permanent lock, install a screw in the track immediately above the window on both sides. You will no longer be able to raise the window.

FREQUENTLY ASKED QUESTIONS

What if my window is slightly too narrow?

The sash can be trimmed up to 3/4” in cases where it is a bit too wide to fit into the track. Remove the spring-loaded adjustment pieces using a #2 Phillips head screwdriver. Using a clamp and a flat surface, cut off the flanges using a jigsaw with a metal cutting blade. You can also use a hacksaw, though it is more labor intensive and you may end up with a less clean cut. The dark area marks where you can trim:

What if my window doesn’t open enough?

Some windows will have stops that prevent them from fully raising up. In some cases, these can be removed allowing it to go up far enough to get the sash in place. You want to be careful when removing them, as it could damage the window or void the window’s warranty.

What if the track is too narrow for the pet door?

The spring adjustment pieces are slightly wider than the rest of the pet door, which may prevent it from fitting in the track. There are several potential solutions. One, you can trim one of the flanges off the spring-loaded adjustment piece, turning the "U" shape at the end into an “L". Alternatively, you can remove just one of the adjustment pieces with a Phillips head screwdriver and add shims for a snug fit.

You could also use a small piece of board in the channel of the adjustment piece, shown here. This board can be thinner and extend into the track giving the tension you need to hold it in place. Last option would be to install the sash using brackets to screw it into the track. Brackets would need to be made or purchased from your local hardware store.

What can I do if the track is wider than the pet door?

If the track is too wide to support the sash upright, you can use foam weather stripping or shims inserted into the track on the sides and/or bottom to fill up any of the gaps causing it to wobble. For a more permanent option, you can toe nail the sash into the framing with screws.

Switch the Side of the Flap

You can switch which side of the sash panel the pet door flap is on to best fit your home.

Step 1

  • Remove the screws on the top and bottom closest to the edge of the pet door. Then slightly loosen the screws closest to the glass. Next, slide off the side piece, then the flap assembly.

Step 2

  • Rotate the flap assembly (essentially flipping it upside down) then slide it back in. Make sure the locking cover is on the same side as the width adjustment locks.

Step 3

  • Replace the end spacer and screws.

FAQ

Is the Dragon sash window pet door easy to install?

Yes, the Dragon sash window dog door is easy to install in a matter of minutes. The spring-loaded design allows you to easily insert the panel in your sash window track.

How do you lock a sash window doggy door?

To lock your sash window with a dog door window insert, a good option is to install a wooden dowel in the track above the window. For a permanent lock, install a screw in the track immediately above the window on both sides. 

Do you sell any replacement flaps?

Yes, we carry replacement flaps for our doors.

Can my large and small dog share this pet door?

Yes, but before you purchase, make sure to follow sizing guidelines and measure your pet before purchasing. Make sure the size of the door is based off your tallest pet, but installed low enough for your smallest pet.

How do I know what size will be best for my dog?

You want to make sure that the top of your new pet door clears your dog's back by 1-2 inches minimum. Make sure the step-over is less than 1/3 of your dog's height in order to ensure that the pet door is as comfortable for your dog to use as possible. Lastly you want the width of the door to be wide enough to allow your dog and cat to go through without touching the sides. Here's a guide on how to measure your pet with tips on how to determine the correct size.

I want to get the large pet door for my dog, but I am worried that a burglar could fit through it.

Every Dragon Pet Door comes with a locking cover. This cover can be used to keep your dog in as well as keep intruders from entering your home.

Is there a difference between the single flap and the double flap?

The double flap option provides increased insulation against the cold. Both options have magnets on the flap to keep the door sealed in wind.

What do I do if my window opens left to right?

If you have a horizontal-opening window, then you should check out the Dragon Single Flap Pet Door For Windows.

Warranty

Dragon Pet Doors One Year Warranty

Dragon Pet Doors have a one-year warranty for normal wear and tear and manufacturing defects.

Customer Reviews

Dragon Double Flap Pet Door for Sash Windows

Small / 25" - 28" / White Edit

A close-up of a white Dragon brand double flap pet door insert for aluminum sash windows, slightly tilted open.

Size Chart

Flap Dimensions:

5 3/8"w x 7 1/16"h

The entry way your dog goes through.
flap dimensions
Height To Raise Window

Height To Raise Window

15 7/16"

How high you must raise your window in order to fit the panel into the track.

Flap Dimensions:

7 1/16"w x 13 1/16”h

The entry way your dog goes through.
flap dimensions
Height To Raise Window

Height To Raise Window

21 5/8"

How high you must raise your window in order to fit the panel into the track.

Flap Dimensions:

9 3/8"w x 16 9/16"h

The entry way your dog goes through.
flap dimensions
Height To Raise Window

Height To Raise Window

25 5/16"

How high you must raise your window in order to fit the panel into the track.
Flap SizeFlap DimensionsStep OverHeight to Raise WindowRecommended Pet Height*
Small5 3/8"w x 7 1/16"h3"15 7/16"9" - 12"
Medium7 1/16"w x 13 1/16"h3"21 5/8"11" - 16"
Large9 3/8"w x 16 9/16"h3"25 5/16"11" - 22"

 

*measured from the ground to the tallest point of their back.

IMPORTANT SIZING INFORMATION

The Dragon Pet Door’s two-piece flap is designed to tear away for your pet’s safety. If you pet door is not the right size for your pet, they may break off flap during normal use. Follow these sizing tips to help ensure that you are buying the right Dragon Pet Door size:

  • Check the Flap Height: You must measure your dog before purchasing a pet door. A large dog may not fit in a “large” pet door. The tallest point of your dog’s back should be at least 1” beneath the top of the flap. 
  • Check the Step-Over: Your pet should be able to over the bottom of the flap comfortably. If the distance from the floor to the bottom of the pet door (called the stepover) is too high, your dog’s paw may catch in the pet door’s U-gasket. It’s better to have a taller pet door that is lower to the ground than a smaller pet door that is too high up.
  • Check Your Entry/Exit Level: The inside of your home may be higher than the ground outside. This means that your door may have different step-over heights depending on whether you are indoors or outdoors. Try to use the lower level when picking your step over height. You can also even of the different levels with a ramp or platform. 
  • Reinforce Your Flap: Every Dragon Pet Door comes with instructions for how to reinforce the screws keeping your flap in place. If you are worried in any way that your pet may rip off the flap, we recommend preemptively reinforcing your flap. Note that doing so will negate the teat-away safety feature. 

If you have any questions about which size pet door your pet needs, please contact our team of pet door experts for guidance and recommendations. 

Find The Best Pet Door Size For My Pet

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Pet Height: inches

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Pet Width: inches

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installation video image
Installation icon Difficulty Easy
Installation icon Steps 04
Installation icon Time Required 0.5 hours
Installation icon Sections 03
Installation icon Flags 01

Parts

  • 1 Sash Window Insert with a Pre-Installed Single Flap Dragon Pet Door
  • 1 Foam Weather Strip
  • 1 Locking Cover

Tools

  • Flathead Screwdriver

Please read instructions & notes thoroughly before installation.

Step 1 Release Spring Mechanism

  • Loosen the width adjustment locks at the end of the sash with a screwdriver. This allows the spring mechanism to move freely from side to side.
  • Watch out, it might jump at you the first time.

Step 2 Test Fit in Window Track

  • Before applying weatherstripping, insert the sash into the window track to test he fit.
  • Push into the spring mechanism and swing the opposite end into the opposite window track. Gently release then tighten the width adjustment locks.
  • Ensure that the pet door sits correctly in the window. See the FAQ for guidance if the sash does not quite fit.

Step 3 Apply Weather-Stripping

  • Once you have confirmed the sash fits, loosen the width adjustment locks and remove it from the frame.
  • Apply the foam weatherstripping by peeling back the paper and exposing the adhesive. Unroll it along the edge of the sash, pressing to ensure it adheres.
  • Use scissors to trim the strip to fit the length of your sash. Apply to both the top and the bottom.

Step 4 Lock Into Track

  • Place the sash back into the window, then tighten the width adjustment locks to lock it in place.

LOCKING YOUR WINDOW

For a temporary lock, place a removable wooden dowel or charley bar in either track above the window, shown here. For a permanent lock, install a screw in the track immediately above the window on both sides. You will no longer be able to raise the window.

FREQUENTLY ASKED QUESTIONS

What if my window is slightly too narrow?

The sash can be trimmed up to 3/4” in cases where it is a bit too wide to fit into the track. Remove the spring-loaded adjustment pieces using a #2 Phillips head screwdriver. Using a clamp and a flat surface, cut off the flanges using a jigsaw with a metal cutting blade. You can also use a hacksaw, though it is more labor intensive and you may end up with a less clean cut. The dark area marks where you can trim:

What if my window doesn’t open enough?

Some windows will have stops that prevent them from fully raising up. In some cases, these can be removed allowing it to go up far enough to get the sash in place. You want to be careful when removing them, as it could damage the window or void the window’s warranty.

What if the track is too narrow for the pet door?

The spring adjustment pieces are slightly wider than the rest of the pet door, which may prevent it from fitting in the track. There are several potential solutions. One, you can trim one of the flanges off the spring-loaded adjustment piece, turning the "U" shape at the end into an “L". Alternatively, you can remove just one of the adjustment pieces with a Phillips head screwdriver and add shims for a snug fit.

You could also use a small piece of board in the channel of the adjustment piece, shown here. This board can be thinner and extend into the track giving the tension you need to hold it in place. Last option would be to install the sash using brackets to screw it into the track. Brackets would need to be made or purchased from your local hardware store.

What can I do if the track is wider than the pet door?

If the track is too wide to support the sash upright, you can use foam weather stripping or shims inserted into the track on the sides and/or bottom to fill up any of the gaps causing it to wobble. For a more permanent option, you can toe nail the sash into the framing with screws.

Switch the Side of the Flap

You can switch which side of the sash panel the pet door flap is on to best fit your home.

Step 1

  • Remove the screws on the top and bottom closest to the edge of the pet door. Then slightly loosen the screws closest to the glass. Next, slide off the side piece, then the flap assembly.

Step 2

  • Rotate the flap assembly (essentially flipping it upside down) then slide it back in. Make sure the locking cover is on the same side as the width adjustment locks.

Step 3

  • Replace the end spacer and screws.

FAQ

Is the Dragon sash window pet door easy to install?

Yes, the Dragon sash window dog door is easy to install in a matter of minutes. The spring-loaded design allows you to easily insert the panel in your sash window track.

How do you lock a sash window doggy door?

To lock your sash window with a dog door window insert, a good option is to install a wooden dowel in the track above the window. For a permanent lock, install a screw in the track immediately above the window on both sides. 

Do you sell any replacement flaps?

Yes, we carry replacement flaps for our doors.

Can my large and small dog share this pet door?

Yes, but before you purchase, make sure to follow sizing guidelines and measure your pet before purchasing. Make sure the size of the door is based off your tallest pet, but installed low enough for your smallest pet.

How do I know what size will be best for my dog?

You want to make sure that the top of your new pet door clears your dog's back by 1-2 inches minimum. Make sure the step-over is less than 1/3 of your dog's height in order to ensure that the pet door is as comfortable for your dog to use as possible. Lastly you want the width of the door to be wide enough to allow your dog and cat to go through without touching the sides. Here's a guide on how to measure your pet with tips on how to determine the correct size.

I want to get the large pet door for my dog, but I am worried that a burglar could fit through it.

Every Dragon Pet Door comes with a locking cover. This cover can be used to keep your dog in as well as keep intruders from entering your home.

Is there a difference between the single flap and the double flap?

The double flap option provides increased insulation against the cold. Both options have magnets on the flap to keep the door sealed in wind.

What do I do if my window opens left to right?

If you have a horizontal-opening window, then you should check out the Dragon Single Flap Pet Door For Windows.

Warranty

Dragon Pet Doors One Year Warranty

Dragon Pet Doors have a one-year warranty for normal wear and tear and manufacturing defects.