Dragon Vinyl Window Pet Door

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  • Cost-effective pet door insert for horizontal vinyl windows
  • Spring-loaded panel adjustment for quick, tool-free installation in most vinyl window sizes 
  • Energy-efficient, two-piece flap design keeps pet door opening sealed
  • Option of a single or double flap depending on insulation needs 
  • Flexible, lightweight flap is easy for both dogs and cats to use

The Dragon Vinyl Window Pet Door is a cost-effective panel insert for horizontal vinyl-framed windows. Available in two height adjustment ranges, the panel with a built-in pet door fits most vinyl windows. The flexible, translucent Dragon flap is easy for pets of all sizes to use, perfect for pets sharing the door. The window panel installs with a simple spring-loaded adjustment method, allowing you to quickly take it in and out of your window track—no drilling or cutting required. There are other installation types for the Dragon Pet Door. Already have a Dragon pet door? See which replacement flap fits your door.


  • Sturdy vinyl frame fits comfortably in your window track
  • Flexible polyolefin elastomer flap is easy for pets of all sizes to use, option of a double flap for improved insualtion
  • Two-piece flap design covers the entire pet door opening for improved sealing
  • UV-resistant additives in the pet door flap and frame protect against weather damage
  • Single-pane, tempered glass optimal for moderate climates
  • Spring-loaded panel installs tool-free into the window track Adjustable height ranges to fit most vinyl sliding windows
  • Magnets keep the flap sealed when not in use
  • Includes a locking cover to block access when needed 



  • Vinyl panel matches your existing frame for the perfect fit and streamlined look
  • Lightweight flap and frame, easy for pets of all sizes to use
  • Low-impact, tool-free installation—no drilling or cutting required

Size Chart

Flap Size Flap Dimensions Step Over Overall Panel Width Recommended Pet Height* Stock No
Small Coming soon! Coming soon! Coming soon! Coming soon! 01DF-A10SS
Medium 7"w x 13 1/10"h 5" 14 3/5" 12" - 16" 01DF-A20MM
Large 9 2/5"w x 16 3/5"h 5" Coming soon! 12" - 19" 01DF-A30LL

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

Dimension Definitions:

Flap Dimension Definition Panel Dimension Definition

Don't know which size to get? Here is a measurement guide to help you out.

Wondering how to measure your track? Review our Track Measuring Guide.

Your Track Height Adjustment range is based on the measurement of your door height from the lowest point of your track to the highest point. Each Dragon patio panel has a 3" adjustment range with your window track height approximately in the middle. The following adjustment ranges are available:

  • Short (Size F): 34" – 37"
  • Regular (Size J): 46" – 49"

CAUTION: If your measured track height is near the bottom of the adjustment range then you should review A Note of Caution.

Installation Instructions


1 Window Insert with a Pre-Installed Dragon Pet Door (single or double flap)

1 Foam Weather Strip Seal

1 Locking Cover 



Step 1: Loosen the thumb screws at the end of the pet door insert. This allows the spring mechanism to move freely up and down. Watch out, it might jump at you the first time!


Step 2: 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.

If the panel still doesn't fit, see the FAQ for guidance.


Step 3: Once you have confirmed the panel fits, remove the panel from the track and lay it on its side. Apply the foam weather-stripping 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: Place the panel back into the window, then tighten the thumbs screws to lock it in place. Installation complete!

dragon dragon


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 thumb screw which 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 will work. If there’s less, a dowel is necessary.



What if my panel is slightly too tall?

You can trim up to 5/16” 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.


The dark area marks where you can trim:


What if my panel is slightly too short?

We offer height extensions that will add 1-1/2" to the top of the panel that you slide into the channel at the top. These are made from the same vinyl as the panel so the color will match exactly. 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 1-1/2", 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.


How do I lock my window pet door insert?

The spring-loaded pressure system will secure the panel in place in your window track. However, if you want a semi-permanent installation, you can toenail a screw to the side of the Dragon window panel to secure it in place. For further security, you can install a Charley Bar.

Is the flap easy for pets to use?

Yes, the Dragon flap is very flexible and lightweight, so it's easy for pets to use. It's a great option if you have dogs and cats sharing.

What's the difference between single and double flap?

The double flap will be more insulating than the single flap. Keep in mind that this door is intended for more moderate climates

Can I start with a single flap and upgrade to double later?

Yes, since the flaps are installed on the outside of the frame, you can easily add a second Dragon Flap later for improved insulation.

Is the flap see-through?

The flap is translucent. It has a slight tint but you can still see through it.

Do you need tools to install the dragon pet door for vinyl windows?

You do not. The spring-loaded design allows for tool-free installation. To install, you'll insert the panel into your window track, loosen the screws at the top, raise the panel up into the top of the window track, then tighten the screws. The only exception to this would be if you are adding screws for additional security.

What's the 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.

I want to get the large pet door for my dog, but I am concerned about a person fitting through it.

All Dragon Pet Doors come with a locking cover. This cover can be used to keep you doggy in. It also can be used to keep intruders from entering your home. It slides into the interior frame.

How do I know what size is best for my dog?

When installing the pet door you want it to clear the top of your dog's back by 1-2 inches, minimum. To give your pet the most comfortable pet door possible, make sure the step-over is less than 1/3 of your dog's height. Lastly you want the width of the door to be big enough to allow your pet 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.

Are replacement flaps available?

Yes, you can buy Dragon replacement flaps.

Where can I install the Dragon Pet Door?

The Dragon Pet Door has multiple Installation options. You can install it in Regular Doors, as a Wall mount, Aluminum Sliding Doors, Vinyl Sliding Doors, Sash Windows, Vinyl Windows, and Horizontal Windows.

Can my small and large dog share this pet door?

Yes, but make sure to follow standard Measuring Guidelines. Make sure the size of the door is based off your tallest pet, but installed low enough for your smallest pet.

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