Pet Door Guys - "In The Glass"

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  • Replaces original pane from your sidelight, sliding glass door, or French door with a dog door built into the new, custom-made pane
  • Comes with pre-installed Endura Flap® doggie door for ultimate weather resistance
  • Insulating and energy-efficient flap
  • Uses existing sliding glass door lock for maintained security
  • Measurement and installation require a professional glazier
  • Item only available in the lower 48 United States
  • This is a custom product all orders are final, no returns

In need of a pet door that won't compromise the security of your home? Unlike the inserted patio panel doors, the In the Glass model uses your existing sliding glass door to ensure that your house looks the same way that it did prior. This custom-made design replaces the existing glass in the sliding glass door with a new, durable pane. It comes pre-installed with the high-quality Endura Flap® doggie door, which is an insulating, flexible flap that withstands extremely harsh climates. In addition to the added security, the In the Glass model has a sleek design that doesn't inhibit the view through the glass. Matching to your current slider frame, this door has a seamless installation that is as aesthetically pleasing as it is well-engineered.

Check out of full selection if you need a different pet door for sliding glass.


  • Tempered, dual-pane glass matches the original glass. If the original glass pane is Low-E or tinted, you have the option of selecting this glass type for an additional charge
  • Vinyl frame comes in white or beige
  • Flap sizes range from small to extra-large 
  • Custom step over options add 2" or 4" to your current step over of 3 3/4" plus your frame height
  • Works for cats or dogs
  • Sturdy Endura Flap® energy-efficient pet door combats severe, four-season climates with magnetic lining
  • Clear flap allows your pet to see through comfortably
  • Locking cover included


  • Easy entry and exit for people and pets
  • The built-in design doesn't take up additional space
  • Doesn't require weatherstripping like patio pet door panels
  • Ensures door security by using the original door lock
  • Keeps out bugs and prevents wind and rain from blowing through
  • You no longer have to let your pets in and out at all hours of the day
  • Saving the original glass pane allows you the option to reinstall it in the future if need be
  • Quick installation process

Purchasing Process:

Step 1: Prior to purchasing your In the Glass Endura Flap® Pet Door, determine which pane of glass you would like to install the pet door unit in. Next, hire a glazier to measure the width, height, and thickness of the existing pane that the custom-made pane will replace.

Note: It is crucial that these dimensions are accurate, as all of the panes are custom-made and non-returnable. Ask your glazier to determine if you have tinted, Low-E, or clear glass. They should review the detailed information page for more specific instructions.

Step 2: Based on the pane measurements from your glazier, select either Standard (34 x 76 or less) or Oversize (anything larger than 34 x 76) Glass Type for your custom-pane. If it is the Standard Glass Type, the product can be shipped directly to your house. If it is Oversize, it must be shipped to your local glass company or another non-residential business address. Next, select flap size (reference this measurement guide), frame color, clear or Low-E, and step over height.

Exact pane dimensions are not yet entered in one of the dropdowns when you are choosing options on the website. Once you place your order, we'll email you an order form to provide the exact measurements from your glazier (explained in the next step). As soon as your order is completed, you will receive an email with an order form where you will fill out your custom dimensions and the side of the door in which you want the dog flap installed. You can request to center the pet door positioning for an additional charge.

Fill out the form and send it back to Your order will be on hold until we receive this information. Please refer to our full set of instructions

Step 3: Once your order is complete, you will receive an email with an order form to fill out your custom dimensions and the side of the door in which you want the pet door opening. You can request to have the pet door centered (rather than left or right) for an additional charge.

When selecting a pet door location, choose the placement based on viewing from the outside-looking-in.

Fill out the form and send it back to Your order will be on hold until we receive this information. See our full set of instructions for technical installation specifics. Please note that this door may take 3-4 weeks to build, as it is custom-made. Allow transit time for delivery.

Step 4: Once the door has arrived, schedule to have the glazier who took the initial measurements to come back for installation. They will remove the original pane and install the new In the Glass dog door into the sliding glass door frame.

Note: Building will take three to four weeks, as it is custom-made. Allow transit time for delivery as well. You will receive a tracking update once ships so you can schedule installations properly.

Size Chart

Glass SizePet Flap SizeFlap Dimension
Standard - Less than 34" x 76" Small 6"w x 11"h
Medium 8"w x 15"h
Large 10"w x 19"h
Extra Large 12"w x 23"h

 Oversized - up to 46" x 92"

(Must ship to glass company)

Small6"w x 11"h
Medium8"w x 15"h
Large10"w x 19"h
Extra Large12"w x 23"h

NOTE: The stepover height is 3-3/4 inches above the bottom frame of your door.

Can only be shipped within the lower 48 United States. No international, AK, or HI shipping is available.

Need help with flap size? Check out our measurement guide.

NOTE: This is only the glass unit and not the entire sliding door with a built-in dog door.

Additional Information

Frame Material


Flap Material

Engage Polyolefin

Flap Colors


Flap Thickness


Flap Warranty (if separate)


Warranty Period

10 years

Return Period

Not Returnable

Locking Cover Material

Dimensional ABS

Your Maximum Pet Size

Cats, Large Cats, Small Dogs, Medium Dogs, Large Dogs, X-Large Dogs

Climate Suitability

Severe-4 Season

Flap Design

Single, One Part, Flexible, Insulated Flap

Ability to Lock Flap

Separate Locking Cover-Loads from Top

Can Be Installed In

Dual Pane Glass Sliding Glass Door, French Doors, Sash Windows, Sidelight, Sideways Sliding Windows, Single Pane Glass Sliding Glass Door, Vinyl-Framed Sliding Glass Door

Award Winning Design


Sealing Value

Very High

Wind Resistance

Very High

Replacement Flaps Available


Insulation Value



What is an "In the Glass" Pet Door?

Design of the Endura Flap®


When I purchase a “Through the Glass” dog door, is the entire sliding glass dog door included?

No, when you purchase a “Through the Glass” dog door, it comes with the glass panel only. The framing of the sliding door is NOT included in the purchase. Since this unit will replace the current glass inside your framing, there will be an installation process you or a hired professional will need to follow as well as filling out the appropriate order form.

If you want a door with a dog flap already installed, check out our collection of doors with dog doors.

Through the glass pet doors are a great option!

How do I order a Pet Door Guys dog door installed in a sliding glass door?

  1. Check out our Placement Guide, which will show you where the pet door should be installed based on your sliding glass situation
  2. Contact a glazier from a local glass shop to measure and install your unit
  3. Measure your pet to get an accurate flap size. The In the Glass unit comes with a 3 ¾" step-over in addition to any step-over your frame has right now, which you will need to take into account
  4. Place the order on this page to receive the order form asking for your custom dimensions. Your order is on hold until we receive this order form. The form is emailed directly to you as you complete your order.
  5. The custom-built glass will be made and shipped with your pre-installed pet door for your sliding glass door.

What exactly comes with an In the Glass purchase?

Only one piece is glass is purchased at a time, as this is not a full door pet door unit, just the glass part. This piece of glass will be installed into your patio frame. What makes this option great is the pet door that comes installed in the glass. Either your slider or stationary glass will be replaced with an identical piece of glass with a pet door flap and frame installed. We do not carry the full patio doors with dog door already built in.

What does it mean by standard and oversize glass size?

Standard Glass Size has a square inch range of 34" x 76" or smaller. Oversized Glass Size would be any range over 34" x 76" and up to 46" x 92". Both work with Single or Dual-Pane Tempered Glass.

Can this be used for a dog door for a glass panel door?

Yep! But only if it is one solid pane. If you have individual panes and just need to replace one or two of those, you would want to use the Hale Custom Dimension Door.

When will I get the email asking for my dimensions?

As soon as you place your order, an email will be sent asking for the custom dimensions of your glass.

What is the minimum step-over?

The minimum step-over on the "Through the Glass" units is 3 3/4" plus however tall the frame of the sliding door is.  If your frame is 2” tall, then the minimum step-over would be 5-¾”.  There are 2" or 4" step-over add-on options as well; these will add 2” and 4” to the minimum to raise the step-over to accommodate taller pets.

Where can I find someone to install this?

If you need help finding a glazier, please visit our Installation Page to find someone in your local area. Please note, not all areas may have a glazier listed.

What does my glazier need to measure?

Your glazier will need to have the thickness, height, width, and whether your glass has Low-e coating or not.

What step-over does this come with already?

Originally, there is a 3 3/4" step-over. Plus, however tall your slider frame is from the floor. You can purchase a custom 2" or 4" step-over to accommodate your pet's size. Make sure the top of the frame will be at least an inch above their shoulder with or without a step-over.

Why does the price jump so much when I change pet door sizes?

"Through the Glass" units can be pretty expensive because you're getting a custom unit made entirely to your specifications. These items can get expensive because of the quality you are purchasing. You are paying for the quality of materials in the glass, metal, and flap; which will save you on AC/heating bills and require less in replacement parts.

What is Low-e coating?

It stands for Low-emissivity coating. Low-e is applied to the inside of the glass to cut back on the heat and cold transfer. Low outside temperatures combined with moist, warm air inside the house can result in condensation on the inside of any glass window, including that in a patio door. Dual-pane, low-e glass can greatly reduce or eliminate this problem. This feature is especially important in cold climates.

What are the benefits to the "Through  the Glass" units?

The "Through the Glass" units do not take up space for you to walk through like a patio panel pet door would.  This is a huge benefit if you have a smaller retrofit slider, as now you don’t have to worry about trying to squeeze through sideways.  Additionally, the "Through the Glass" doggie doors utilize your existing lock, so you will not have to worry about how to go about securing your home.

Through the glass vs. patio panel

In terms of appearance benefits, it also utilizes your current door frame, so you don't have to worry about matching a new frame with your current door and frame. The constantly open sliding glass door will leave you with extra framing blocking your view outside. When in the glass, you do not experience this issue. The Endura Flap® Pet Door included is great for insulation, so it compliments the dual-pane glass in most new sliders.

Through the glass vs. Patio Panel

How long does it take to get the "Through the Glass" model?

It takes about 3-4 weeks for these types of pet doors to be manufactured. Transit time is about 1-5 business days as it ships from the West Coast. When it ships, we will send a tracking number via email, which will include an estimated delivery date so you can schedule with your installer to come out.

Can you change the flap in the glass units if it wears out?

Yes, you can purchase replacement Endura Flaps® on the website, it might sound strange, but you will need to purchase the one for the Door/Wall Mount since that includes the hole plugs.  However, they can be a little difficult to replace because you must remove the whole frame in order to get the new flap into place properly.

Can I lock the pet door when I don't want my dog to use it?

The flap itself will be coming with a locking cover. This cover slides on the track of the frame to securely prevent access.

Can I get this shipped to my house instead of the glass company?

If you get the standard sized pet door,  it can be shipped to a home. However, if you have an oversized unit, it is best to ship to your glass company. Additional fees will be charged to your account if an oversized unit goes to a residential location.

I bought this from, but it was made somewhere else. Who do I go to for warranty?

The flap and frame assembly is made by, whereas the glass company who made your glass and installed the door is Pet Door Guys. If you have issues regarding the pet door itself, please contact The EnduraFlap has a 15 year warranty period. For the glass unit, the warranty period is covered for 10 years and goes through Pet Door Guys. 

How will I be able to lock my sliding door?

This item will be placed inside your slider frame. Your lock will still work since it is not replacing your frame or locking mechanism.

Can I install one of the glass units myself?

We highly recommend hiring a glass company to install and measure for you. Depending on how handy you are, it may be possible; however, if the measurements are off, this item cannot be returned due to its customization.

What color is the sliding door with the dog door built-in?

You will use your existing frame, so the color of the frame does not change. There is a crossbar and dog door frame that will be white.

What is the tallest in-glass dog door I can buy?

The largest glass dimensions are 92" tall and 46" wide.

Can I purchase a sliding glass door with pet door already installed?

The best option for dual-pane sliding glass doors with doggie door built in is to replace one your existing glass panels. This can be cheaper and is much less disruptive than replacing your entire sliding glass door.

What is the tallest step-over/threshold I can get for a sliding glass door with dog door built in for my greyhound?

It is 7 3/4" above top of the bottom frame. You will want to add the frame height + 7 3/4" to calculate the stepover height.

Will this work in an older single pane sliding glass door?

The minimum thickness of the glass or Insulated Glass Unit (IGU) has to be 5/8" thick. If it is 5/8" or thicker then yes, this doggie door in glass door will work.

I want a sliding glass door with a dog door built-in, but what if I sell my home and the new owner doesn't want it?

We recommend that you save the original glass panel so that the process can be reversed. It will only cost the time of the glazier (glass company) to come out and reverse the process.

How do I get a sliding patio door with a dog door built-in?

Our process involves replacing one of your existing glass panels with a new panel that has the pet door built-in. We recommend working with a professional glazier to ensure it is done correctly since these are custom made and non-returnable. You can view a demonstration of the installation process on the Video tab.

Can I get a black sliding glass door with a pet door built-in?

No. The Pet Door Guys in the Glass is available with a white pet door only with either white or beige vinyl components.

What is the maximum step-over height I can get for a sliding door with a pet door built-in?

The step-over height of the pet door glass door depends on the height of the bottom frame that you are installing the In the Glass pet door in. The maximum height can be 7 3/4" plus the height of your bottom frame. This unit default is 3 3/4" above your bottom frame and also has the option of 5 3/4" above the bottom frame.

Does the sliding door with a dog door already installed include the frame?

No. We do not offer sliding doors with a dog door built-in. This option replaces one of the existing glass panels and is a great solution. It uses your existing frame, so there are much less construction and disruption to your home.

Can I get a black frame on a glass sliding door with a dog door built-in?

No. We currently offer the sliding glass doors with pet door built-in in white and beige trim.

Does my glazier have to assemble the three pieces in this pet door In the Glass door?

No, this sliding glass doors with pet door built in is a single piece replacement unit. Your glazier will remove your existing Insulated Glass Unit (IGU) and replace it with your new IGU that has a pet door built-in. It is one unit.

Are Pet Guys and In the Glass Pet Door Guys the same?

We sell the Pet Door Guys In the Glass pet door units. They make a replacement glass units for doors with built in pet door.

Can I purchase a sliding door with doggie door built-in?

We do not sell a sliding glass doors with a built-in dog door. We sell a glass replacement unit that allows you to keep your existing sliding glass door, which reduces disruption in your home.

I want a sliding glass patio door with doggie door built in. How do I change my current one? 

You can purchase the Pet Door Guys "In the Glass" pet door unit. It replaces one of your patio doors with dog door built-in (depends on operational door). You can watch the first video on the video tab to see how the installation is completed.

I want my existing french doors to change to be doors with doggie door built in. Can you help? 

As long as your french doors are dual-pane glass at least 5/8" thick, then we can help you convert to doors with pet doors built in. The other consideration for doors with built in dog door is that the bottom of the dog door will be 3 3/4" above the top of the bottom frame.

What is the step-over height for built-in dog door sliding glass? 

The step-over height for pet doors for sliding patio doors can be calculated as 3 3/4" + height of bottom frame. Each sliding doors with pet door built-in can vary.


Pet Door Guys Limited Warranty guarantees it will repair or replace any Pet Door Guys product which is found to be defective in material or workmanship and will pay the costs of repair or replacement to the original owner for a period of 10 years. Insulated glass is warranted for life against seal failure. The Endura Flap has a lifetime warranty.

This warranty is subject to the following terms and conditions:

  1. 1. This guarantee is offered only to the original owners of single family homes who purchase a Pet Door Guys product in the United States. It is not transferable and terminates upon sale of the home and does not apply to re-installation at a second location.
  2. 2. The warranty does not extend to commercial applications.
  3. 3. Pet Door Guys is not responsible for glass breakage, failure due to misuse, applied tints or films, any customer alterations to the product including painting, improper installation or acts of nature including fire, flood or earthquake. Pet Door Guys is not responsible for natural weathering of exterior finishes or corrosion in highly corrosive environments.
  4. 4. Pet Door Guys is not responsible for incidental or consequential damage beyond our control. Pet door openings imply some risk. No guarantee is offered or implied regarding suitability or security against intrusion or unwanted entry or exit.

Pet Door Guys: 1-855-380-8246

Endura Flap: 1-800-826-2871

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