Whiskers & Windows Cat Door For Sliding Glass Door
- Fast, easy installation and removal with spring-loaded frame, no tools required
- Adjustable height to fit most sliding doors (Measuring Guidelines in Details below)
- Patio pet door panel comes with foam weather stripping for insulation
- Aluminum frame in black or white and plastic pet door are durable and corrosion resistant
- Perfect for cats and very small dogs
- Potential 7-10 Business Days Delay in shipping

Product Details
The Whiskers and Windows Cat Door Panel is a quick, affordable way to give your cat or small dog access to the backyard. This sliding glass door insert doesn't require drilling or cutting, so it installs in seconds! The ingenious spring-loaded design allows for an adjustment of up to 3 inches, with 2 adjustment ranges to choose from. Foam weatherstripping is included to ensure a snug seal from the elements around the panel. This kitty door for sliding glass doors comes in white and black color options, ensuring that it will match your sliding glass door framing. Great pet door for cats and very small dogs. This pet door will give you and your little furry buddies the freedom to come and go. Small and Large pet doors have a 4-way lock to provide security and access control. Use the red and green locking tabs to close it so nothing can enter or exit, allow access freely in and out, allow the pet to come in only and not go back out, or out only so they can't come back in until you let them.
Features:
- Simple, speedy installation
- No tools make these perfect for rentals
- Adjustments fit most siding doors
- Small flap fits most cats up to 10Lbs, while Large accommodates cats and small dogs up to 15Lbs
- 4-way locking to control pets access ( Unlocked both tabs center | Locked both tabs outside | Out-only both tabs to right | In-only both tabs to left)
- See the monorail adapter page if you have a monorail track
Size Chart
Flap Size | Flap Dimension | Step Over Height | Overall Panel Width |
---|---|---|---|
Small | 6"w x 6"h | 3-1/2" | 13" |
Large | 7"w x 7 3/4"h | 3-1/2" | 15 1/2" |
Adjustment Ranges:
- Short: 74¾" - 77¾"
- Regular: 77¼" - 80¼"
Pet door has 1" framing, measure your track width to make sure that your window will accommodate the panel.
Wondering how to measure your track? Review our Track Measuring Guide.
Installation Instructions
Parts
- Panel Pet Door
- Foam Weatherstripping
- C-Clamp Lock
Tools
- None
Please read instructions & notes thoroughly before installation.
Step 1 Release Spring Mechanism

- Release the automatic height adjustment by turning the knobs located at the top of the panel counter-clockwise.
Step 2 Test-Fit the Panel in Your Track

- Open the sliding door and insert the panel with the knobs facing inside. Place the top edge into the top track of the window.
- Lift up and swing the lower portion of the panel into the bottom track.
- Slide the pet door panel against the door jamb. Make sure that the top is fully extended (not tilted to one side) and the bottom of the panel is on the ridge in the bottom track.
Step 3 Apply the Weather Stripping

- Once you are certain the panel fits, remove it from the sliding door track and lay it on a flat surface.
- 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.
- Install on both sides, trim to fit with scissors.
Step 4 Reinstall the Panel

- Once the foam weatherstripping is installed, repeat steps 1-3 to install the panel. Hand-tighten the knobs by turning clockwise to lock the sliding glass pet door in place.
Whiskers & Windows Locking Details
Locking the Flap
- To change the 4-Way Lock setting, ensure that the flap is in the vertical resting position, and gently move the tabs left or right as desired. The tabs should move freely without requiring excessive force.
- Locked: Both tabs on the outside.
- Out-only: Both tabs to the right.
- In-only: Both tabs to the left.
- Unlocked: Both tabs in the center.

Installing the Clamp Lock
- This clamp has a screw that tightens by hand to prevent the sliding door from moving beyond the clamp’s placement.
- For doors manufactured with the glass slider on the inside track, the lock can usually be installed on the door’s raised track.

Alternative Locking Method
- A great alternative to locking your sliding glass door 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 door away from the pet door panel.

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.

Videos
How to Measure Your Sliding Glass Door for a Pet Door
FAQ
How big of a dog can go through this? The Large Flap would accommodate a dog about 15Lbs, and no more than 10" at the shoulder. |
Can you lock it? Yes, it has a 4-way lock with means you have 4 different access options. You can set it for totally locked, so nothing can go in or out. Open, so they can go in and out as the please. In only, so that once they come in they can't go back out until you let them. Or out only, so once the exit they will need you to let them back in. |
Is the flap see through? It is tinted, but you can easily see through it. |
Is it hard for pets to use? It does not require much force so it will be easier for smaller pets to use. |
How much does shipping cost? Shipping is calculated at checkout. |
Warranty
1 Year Limited Warranty
The manufacturer guarantees your purchase for a period of one year from the date of original purchase against any defect arising due to faulty materials or manufacture. Accordingly, any defective item will be repaired free of charge or replaced at the manufacturer’s option provided that the defect has not been caused by neglect, misuse, or normal wear and tear and proof of purchase date is supplied. Your statutory rights are not affected.
Customer Reviews

Size Chart
Flap Size | Flap Dimension | Step Over Height | Overall Panel Width |
---|---|---|---|
Small | 6"w x 6"h | 3-1/2" | 13" |
Large | 7"w x 7 3/4"h | 3-1/2" | 15 1/2" |
Adjustment Ranges:
- Short: 74¾" - 77¾"
- Regular: 77¼" - 80¼"
Pet door has 1" framing, measure your track width to make sure that your window will accommodate the panel.
Wondering how to measure your track? Review our Track Measuring Guide.
Installation Instructions
Parts
- Panel Pet Door
- Foam Weatherstripping
- C-Clamp Lock
Tools
- None
Please read instructions & notes thoroughly before installation.
Step 1 Release Spring Mechanism

- Release the automatic height adjustment by turning the knobs located at the top of the panel counter-clockwise.
Step 2 Test-Fit the Panel in Your Track

- Open the sliding door and insert the panel with the knobs facing inside. Place the top edge into the top track of the window.
- Lift up and swing the lower portion of the panel into the bottom track.
- Slide the pet door panel against the door jamb. Make sure that the top is fully extended (not tilted to one side) and the bottom of the panel is on the ridge in the bottom track.
Step 3 Apply the Weather Stripping

- Once you are certain the panel fits, remove it from the sliding door track and lay it on a flat surface.
- 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.
- Install on both sides, trim to fit with scissors.
Step 4 Reinstall the Panel

- Once the foam weatherstripping is installed, repeat steps 1-3 to install the panel. Hand-tighten the knobs by turning clockwise to lock the sliding glass pet door in place.
Whiskers & Windows Locking Details
Locking the Flap
- To change the 4-Way Lock setting, ensure that the flap is in the vertical resting position, and gently move the tabs left or right as desired. The tabs should move freely without requiring excessive force.
- Locked: Both tabs on the outside.
- Out-only: Both tabs to the right.
- In-only: Both tabs to the left.
- Unlocked: Both tabs in the center.

Installing the Clamp Lock
- This clamp has a screw that tightens by hand to prevent the sliding door from moving beyond the clamp’s placement.
- For doors manufactured with the glass slider on the inside track, the lock can usually be installed on the door’s raised track.

Alternative Locking Method
- A great alternative to locking your sliding glass door 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 door away from the pet door panel.

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.

Videos
How to Measure Your Sliding Glass Door for a Pet Door
FAQ
How big of a dog can go through this? The Large Flap would accommodate a dog about 15Lbs, and no more than 10" at the shoulder. |
Can you lock it? Yes, it has a 4-way lock with means you have 4 different access options. You can set it for totally locked, so nothing can go in or out. Open, so they can go in and out as the please. In only, so that once they come in they can't go back out until you let them. Or out only, so once the exit they will need you to let them back in. |
Is the flap see through? It is tinted, but you can easily see through it. |
Is it hard for pets to use? It does not require much force so it will be easier for smaller pets to use. |
How much does shipping cost? Shipping is calculated at checkout. |
Warranty
1 Year Limited Warranty
The manufacturer guarantees your purchase for a period of one year from the date of original purchase against any defect arising due to faulty materials or manufacture. Accordingly, any defective item will be repaired free of charge or replaced at the manufacturer’s option provided that the defect has not been caused by neglect, misuse, or normal wear and tear and proof of purchase date is supplied. Your statutory rights are not affected.
- Reviews
- Questions
Works great, easy install.
Definitely worth the extra cost if you have vinyl sliders. Fits well on PTG WeatherGuard doors. I did have to add weatherstripping between the edge of the inside door and the glass on the opened door.
Not having to get up to let cats in or out!!!
This made easy access to our deck for our cats. In and out on their own!!
LOVE IT
Fits perfect,looks GREAT
Easy to install. The door is somewhat small but works well.
Product is good. Easy install. Some heat loss. The pet door is a bit small. But these are gripes. Its a fine product.
Cats love this door!
This is such a great pet door! My 2 cats love it and started using it right away after it was installed. I modified my curtains so they're not in the way, and I'm just thrilled with the way it all turned out. This pet door is so much better for cats than a flexible plastic flap, and it seals shut after every entry and exit. So far so good!