Dragon Single Flap Pet Door For Windows
- Sturdy panel insert with built-in pet door for aluminum side-sliding windows
- Two-piece flap design seals off pet door opening for improved energy efficiency
- Spring-loaded design for quick and easy installation
- Adjustable height ranges to fit most sliding windows
- Tough, weather-resistant flap is easy for pets to use

Product Details
The Dragon Single Flap Pet Door for Windows is an economically priced window panel insert for sideways-sliding windows. This window doggie door features an efficient two-piece flap design with excellent sealing value. The panel is available in three height adjustment ranges to fit varying window track heights. The window panel's spring-loaded design allows you to install and remove the panel from your window track in a matter of minutes.
The Dragon Pet Door for Windows is also available in a double flap version for improved insulation.
Features:
- Two-piece flap design covers the entire pet door opening for improved sealing
- Flexible polyolefin elastomer flap is easy for pets of all sizes to use
- UV-resistant additives in the pet door flap and frame protect against weather damage
- Weather-resistant single flap and single-pane, tempered glass optimal for moderate climates
- Sturdy aluminum frame designed to fit into window tracks at least 1" thick
- Spring-loaded mechanism installs into the window track
- Available in two track-height adjustment ranges to fit windows 34"-37" or 46"-49" tall
- Magnets keep the flap shut when not in use
- Comes with a tough locking cover to block access when needed
Benefits:
- Quick and easy installation, easily removable, perfect for renters or vacation homes
- Low-impact installation, no drilling or cutting required
- Ability to upgrade from a single flap to double flap at any time with an additional Dragon flap
Size Chart
- Medium 7 1/16"w x 13 1/16"h
- Large 9 3/8"w x 16 9/16"h
Flap Dimensions:
7 1/16"w x 13 1/16"h
The entry way your dog goes through.Step Over Range
3 7/8”
Distance from the bottom of the flap to the floor you pet must step over to enter the pet door.


Overall Panel Width
13 5/8"
How wide the panel is overall.Flap Dimensions:
9 3/8"w x 16 9/16"h
The entry way your dog goes through.Step Over Range
3 7/8”
Distance from the bottom of the flap to the floor you pet must step over to enter the pet door.


Overall Panel Width
15 1/4"
How wide the panel is overall.Flap Size | Flap Dimensions | Step Over | Overall Panel Width | Recommended Pet Height* |
---|---|---|---|---|
Small | Coming 2023 | Coming 2023 | Coming 2023 | Coming 2023 |
Medium | 7 1/16"w x 13 1/16"h | 3 7/8" | 13 5/8" | 11" - 16" |
Large | 9 3/8"w x 16 9/16"h | 3 7/8" | 15 1/4" | 11" - 22" |
*measured from the ground to the tallest point of their back.
Installation Instructions

Parts
- 1 Window Insert with a Pre-Installed Dragon Pet Door
- 1 Foam Weather Strip Seal
- 1 Locking Cover
Tools
- Flathead Screwdriver
Please read instructions & notes thoroughly before installation.
Step 1 Release Spring Mechanism

- Loosen the height adjustment locks at the end of the pet door insert with a screwdriver. This allows the spring mechanism to move freely up and down.
Step 2 Insert Into Window Track

- Before applying weatherstripping, insert the panel into the top track of your framing.
- Push the panel into the spring mechanism and swing the bottom of the panel up and over the threshold into the rail at the bottom.
- If you can’t quite clear the track, try swinging in from the outside as the outside track wall may be shorter.
Step 3 Apply Weather-Stripping

- Once you have confirmed the panel fits, remove the panel from the track and lay it on its side.
- Apply the foam weatherstripping by peeling back the paper and exposing the adhesive. Unroll it along the edge of the panel, pressing to ensure it adheres.
- Use scissors to trim the strip to fit the length of your panel.
- Flip the panel around to apply on the other edge.
Step 4 Lock Into Track


- Place the panel back into the window, then tighten the height adjustment locks to lock it in place.
LOCKING YOUR WINDOW
Since you likely can no longer use your window’s original lock, we have provided you with an alternative locking method to keep your home secure.
Installing the track clamp:
This clamp has a thumbscrew that tightens by hand to prevent the sliding window pane from moving beyond the clamp’s placement. For windows manufactured with the slider on the inside track, the lock can usually be installed on the raised track.

If you aren’t able to use the lock that comes with the panel:
A great alternative to locking your window is a charley bar or dowel in the track. Both work off the same concept - they block the slider from opening. When engaged you cannot pull the sliding pane away from the pet door panel. If there is 15” or more of space for the sliding pane to move, a Charley bar will work. If there’s less, a dowel is necessary.

FREQUENTLY ASKED QUESTIONS
What if my panel is slightly too tall?
You can trim up to 3/4” off the spring- loaded adjustment piece at the top. This can be done by removing the adjustment pieces with a #2 Phillips head screwdriver and cutting down the flanges. Be careful not to cut too low or you will not be able to put the top back on.

The dark area marks where you can trim:

What if my panel is slightly too short?
We offer height extensions that will add 3/4” to the top of the panel that you slide into the channel at the top. These are made from the same aluminum as the panel so you can match the color.

You can also make your own extension out of nominal 1” wood (which is 3/4” thick), such as a 1x3, if you need more than %" in height. Cut it to the same width as the panel and slide it into the channel at the top. Paint the wood to match your frame color. If the extension makes the panel feel unstable, you can secure it with screws.
What if the panel is wobbling slightly back and forth?
If your track is wider than 1” you can use small wooden shims or extra weather-stripping to fill in the gap inside the top and bottom tracks. By placing the material inside the tracks you won't be able to see it, but it will stabilize the panel.
FAQ
Is the Dragon single flap window doggie door easy to install? Yes, dragon windows panels are very easy to install. The spring-loaded design allows for simple installation in a matter of minutes. |
How insulating is the Dragon window pet door? The Dragon window panel pet door is best for mild climates. For more weather protection, check out the Dragon Double Flap Window Pet Door. |
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. |
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

Size Chart
- Medium 7 1/16"w x 13 1/16"h
- Large 9 3/8"w x 16 9/16"h
Flap Dimensions:
7 1/16"w x 13 1/16"h
The entry way your dog goes through.Step Over Range
3 7/8”
Distance from the bottom of the flap to the floor you pet must step over to enter the pet door.


Overall Panel Width
13 5/8"
How wide the panel is overall.Flap Dimensions:
9 3/8"w x 16 9/16"h
The entry way your dog goes through.Step Over Range
3 7/8”
Distance from the bottom of the flap to the floor you pet must step over to enter the pet door.


Overall Panel Width
15 1/4"
How wide the panel is overall.Flap Size | Flap Dimensions | Step Over | Overall Panel Width | Recommended Pet Height* |
---|---|---|---|---|
Small | Coming 2023 | Coming 2023 | Coming 2023 | Coming 2023 |
Medium | 7 1/16"w x 13 1/16"h | 3 7/8" | 13 5/8" | 11" - 16" |
Large | 9 3/8"w x 16 9/16"h | 3 7/8" | 15 1/4" | 11" - 22" |
*measured from the ground to the tallest point of their back.

Parts
- 1 Window Insert with a Pre-Installed Dragon Pet Door
- 1 Foam Weather Strip Seal
- 1 Locking Cover
Tools
- Flathead Screwdriver
Please read instructions & notes thoroughly before installation.
Step 1 Release Spring Mechanism

- Loosen the height adjustment locks at the end of the pet door insert with a screwdriver. This allows the spring mechanism to move freely up and down.
Step 2 Insert Into Window Track

- Before applying weatherstripping, insert the panel into the top track of your framing.
- Push the panel into the spring mechanism and swing the bottom of the panel up and over the threshold into the rail at the bottom.
- If you can’t quite clear the track, try swinging in from the outside as the outside track wall may be shorter.
Step 3 Apply Weather-Stripping

- Once you have confirmed the panel fits, remove the panel from the track and lay it on its side.
- Apply the foam weatherstripping by peeling back the paper and exposing the adhesive. Unroll it along the edge of the panel, pressing to ensure it adheres.
- Use scissors to trim the strip to fit the length of your panel.
- Flip the panel around to apply on the other edge.
Step 4 Lock Into Track


- Place the panel back into the window, then tighten the height adjustment locks to lock it in place.
LOCKING YOUR WINDOW
Since you likely can no longer use your window’s original lock, we have provided you with an alternative locking method to keep your home secure.
Installing the track clamp:
This clamp has a thumbscrew that tightens by hand to prevent the sliding window pane from moving beyond the clamp’s placement. For windows manufactured with the slider on the inside track, the lock can usually be installed on the raised track.

If you aren’t able to use the lock that comes with the panel:
A great alternative to locking your window is a charley bar or dowel in the track. Both work off the same concept - they block the slider from opening. When engaged you cannot pull the sliding pane away from the pet door panel. If there is 15” or more of space for the sliding pane to move, a Charley bar will work. If there’s less, a dowel is necessary.

FREQUENTLY ASKED QUESTIONS
What if my panel is slightly too tall?
You can trim up to 3/4” off the spring- loaded adjustment piece at the top. This can be done by removing the adjustment pieces with a #2 Phillips head screwdriver and cutting down the flanges. Be careful not to cut too low or you will not be able to put the top back on.

The dark area marks where you can trim:

What if my panel is slightly too short?
We offer height extensions that will add 3/4” to the top of the panel that you slide into the channel at the top. These are made from the same aluminum as the panel so you can match the color.

You can also make your own extension out of nominal 1” wood (which is 3/4” thick), such as a 1x3, if you need more than %" in height. Cut it to the same width as the panel and slide it into the channel at the top. Paint the wood to match your frame color. If the extension makes the panel feel unstable, you can secure it with screws.
What if the panel is wobbling slightly back and forth?
If your track is wider than 1” you can use small wooden shims or extra weather-stripping to fill in the gap inside the top and bottom tracks. By placing the material inside the tracks you won't be able to see it, but it will stabilize the panel.
FAQ
Is the Dragon single flap window doggie door easy to install? Yes, dragon windows panels are very easy to install. The spring-loaded design allows for simple installation in a matter of minutes. |
How insulating is the Dragon window pet door? The Dragon window panel pet door is best for mild climates. For more weather protection, check out the Dragon Double Flap Window Pet Door. |
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. |
Warranty
Dragon Pet Doors One Year Warranty
Dragon Pet Doors have a one-year warranty for normal wear and tear and manufacturing defects.

Great product
Everything I imagined it would be. Took some time for my kitty to learn how to use his new door but now he’s a pro. Insulates well as advertised, sturdy and fit my window well.
Good fit
This fits perfectly and is a solid, sturdy frame. My cats got used to it in about 2 days. They were definitely tentative at first but we clipped the outer flap up, so they were able to push right thru.
Good but overpriced
Very good quality, but it arrived damaged so I returned it. My only complaint is the price - it's so much more expensive than similar products for vertical windows and sliding doors and there's no good reason why. Every brand seems to be consistent in that, not just this one. When I had to return it for being damaged I decided to go ahead and try a DIY solution first.
Quality Dog Window
This window is amazing!!! Our 3 yo miniature schnauzer can fit through the door well! It keeps our office nice and insulated, and it is very well built.... might I add that it was like the easiest installation ever?! We love it!