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Whiskers & Windows Cat Door for Horizontal Sliding Windows

Whiskers & Windows Cat Door for Horizontal Sliding Windows

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  • Quick, easy installation for horizontal sliding windows with a spring-loaded frame; no drilling or cutting required.
  • Adjustable height up to 3" to fit most windows, with custom sizing available for unique dimensions.
  • Choose from a small or large flap pet door, suitable for cats and small dogs up to 15 pounds.
  • Durable, corrosion-resistant aluminum or vinyl frame in bronze or white; clear, tinted acrylic pet door with a 4-way lock for security.
  • 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

Product Details


The Whiskers & Windows Cat Door for Horizontal Sliding Windows offers a convenient and stylish solution for pet owners seeking an easy-to-install pet door. Designed to fit most horizontal sliding windows, this pet door can be installed in seconds with its spring-loaded frame that adjusts up to 3 inches. Custom sizing options ensure a perfect fit for your unique window dimensions.

Constructed with a durable, corrosion-resistant aluminum or vinyl frame available in bronze or white, this pet door features a clear, tinted acrylic flap that is both lightweight and easy for your pets to use. The 4-way lock provides flexible access control, so you can choose between in-only, out-only, fully locked, or fully unlocked settings to suit your needs.

Whether you're a renter in need of a low-impact installation or a homeowner looking to provide your pets with the freedom to come and go as they please, the Whiskers & Windows Cat Door for Horizontal Sliding Windows is an excellent choice. The sleek design complements any window sill, and the pet door can even be used to create a seamless connection to a catio, enhancing your pet's outdoor experience.

With the Whiskers & Windows Cat Door for Horizontal Sliding Windows, you'll enjoy the convenience and peace of mind that comes with providing a secure, comfortable pet door solution for your beloved pets.

Can't find the right size? Check out our custom sizing options. Have a sash window? See the Whiskers & Windows Cat Door for Sash Windows

Features:

  • Great for renters due to low-impact installation and easy removal; perfect for those seeking temporary or flexible pet door solutions.
  • Versatile design with options for small cats up to 10 pounds and large cats or small dogs up to 15 pounds.
  • 4-way lock offers customizable access control, enabling in-only, out-only, fully locked, or fully unlocked settings.
  • Clear, tinted flap provides visibility while maintaining privacy; lightweight and easy for pets to use.
  • Ideal for use with a catio, offering a seamless connection between indoor and outdoor spaces for your pet.
  • Allow 3-4 weeks for any custom options

Size Chart

Flap Dimensions:

Single Flap:7 1/2"w x 8"h

The entry way your dog goes through.

Step Over Range:

3 1/2"h

Distance from the bottom of the flap to the floor you pet must step over to enter the pet door.
flap dimensions
step over height
overall panel width

Overall Panel Width:

11 5/8"

How wide the panel is overall.
Flap SizeFlap DimensionStep Over HeightOverall Panel WidthRecommended Pet Height
Large7"w x 7 1/2"h3-1/2" 11 5/8"4" - 10"

 

Window Width Adjustment Ranges:

  • 34" - 37"
  • 46" - 49"
  • Custom Non-Returnable 23" - 34"
  • Custom Non-Returnable 37" - 46" 
  • Custom Non-Returnable 49" - 74.75"

 

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 demonstrated on a sliding glass door.

Still do not know which flap size to get? Here is a measurement guide to help you out

Find The Best Pet Door Size For My Pet

A

Pet Height: inches

B

Pet Width: inches

Please fill the above fields.

Additional Information

Frame Material

Aluminum

Flap Material

Acrylic

Flap Colors

Clear

Dual or Single Pane

Single Pane 3/16" Thick

Your Maximum Pet Size

Cats, Large Cats, Small Dogs

Climate Suitability

Temperate-3 Season

Type of Window

Sideways Sliding

Flap Design

Single

Ability to Lock Flap

Deluxe (4-way lock)

Can Be Installed In

Sideways Sliding Windows

Sealing Value

Average

Wind Resistance

Average

Insulation Value

Average

Installation Instructions

Installation icon Difficulty Easy
Installation icon Steps 03
Installation icon Time Required 0.5 Hours
Installation icon Sections 03
Installation icon Flags 00

Parts

  • 1 Panel Pet Door
  • Foam Weather Strip

Tools

  • Flathead Screwdriver

Please read instructions & notes thoroughly before installation.

Step 1 Release Spring Mechanism

release spring mechanism
  • Release the height adjustment locks by loosening the screws with a screwdriver.
  • The height adjustment panel should fully extend upward (pull up on the top of the panel if necessary).

Step 2 Insert Into Window Track

insert into window track
  • Open the sliding window and insert the cat door 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 window jamb. Make sure that the top is fully extended (not tilted to one side) and the bottom of the panel is on the ridge (pencil rail) in the bottom track.

Step 3 Secure the Panel

secure the panel
  • Tighten the height adjustment locks with a screwdriver.

Whiskers & Windows Pet Door 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.
four way lock detail

What if there is a gap between the panel and my window?

  • Due to the fact that there are many types of windows, you may need to modify your installation using shims or similar materials such as foam weather stripping.
  • If there is a gap, you can use the shims to even out the pet door.

Locking the Panel

  • A great way to lock your sliding 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 door away from the pet door panel.
charley bar location

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:

where to trim adjustment pieces

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.

height extension piece

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.

What do I do if this door doesn't come in a size that will fit my window?

If none of the sizes will fit your window, you can a custom cat door that will fit your window track.

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?

There is a slight tint, but you can see through it.

Is it hard for really small pets to use?

The flap is very easy to push open so small pets have no trouble using it. It is rigid though, so if your pet is timid we would recommend the PetSafe Horizontal Cat Door for Windows.

Could this be used leading out to a catio?

Yes! In fact that is one of the more popular reasons customers get these doors.

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

Whiskers & Windows Cat Door for Horizontal Sliding Windows

White / Aluminum / 34" - 37" Edit

Whiskers & Windows Cat Door for Horizontal Sliding Windows

Size Chart

Flap Dimensions:

Single Flap:7 1/2"w x 8"h

The entry way your dog goes through.

Step Over Range:

3 1/2"h

Distance from the bottom of the flap to the floor you pet must step over to enter the pet door.
flap dimensions
step over height
overall panel width

Overall Panel Width:

11 5/8"

How wide the panel is overall.
Flap SizeFlap DimensionStep Over HeightOverall Panel WidthRecommended Pet Height
Large7"w x 7 1/2"h3-1/2" 11 5/8"4" - 10"

 

Window Width Adjustment Ranges:

  • 34" - 37"
  • 46" - 49"
  • Custom Non-Returnable 23" - 34"
  • Custom Non-Returnable 37" - 46" 
  • Custom Non-Returnable 49" - 74.75"

 

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 demonstrated on a sliding glass door.

Still do not know which flap size to get? Here is a measurement guide to help you out

Find The Best Pet Door Size For My Pet

A

Pet Height: inches

B

Pet Width: inches

Please fill the above fields.

Frame Material

Aluminum

Flap Material

Acrylic

Flap Colors

Clear

Dual or Single Pane

Single Pane 3/16" Thick

Your Maximum Pet Size

Cats, Large Cats, Small Dogs

Climate Suitability

Temperate-3 Season

Type of Window

Sideways Sliding

Flap Design

Single

Ability to Lock Flap

Deluxe (4-way lock)

Can Be Installed In

Sideways Sliding Windows

Sealing Value

Average

Wind Resistance

Average

Insulation Value

Average

Installation Instructions

Installation icon Difficulty Easy
Installation icon Steps 03
Installation icon Time Required 0.5 Hours
Installation icon Sections 03
Installation icon Flags 00

Parts

  • 1 Panel Pet Door
  • Foam Weather Strip

Tools

  • Flathead Screwdriver

Please read instructions & notes thoroughly before installation.

Step 1 Release Spring Mechanism

release spring mechanism
  • Release the height adjustment locks by loosening the screws with a screwdriver.
  • The height adjustment panel should fully extend upward (pull up on the top of the panel if necessary).

Step 2 Insert Into Window Track

insert into window track
  • Open the sliding window and insert the cat door 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 window jamb. Make sure that the top is fully extended (not tilted to one side) and the bottom of the panel is on the ridge (pencil rail) in the bottom track.

Step 3 Secure the Panel

secure the panel
  • Tighten the height adjustment locks with a screwdriver.

Whiskers & Windows Pet Door 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.
four way lock detail

What if there is a gap between the panel and my window?

  • Due to the fact that there are many types of windows, you may need to modify your installation using shims or similar materials such as foam weather stripping.
  • If there is a gap, you can use the shims to even out the pet door.

Locking the Panel

  • A great way to lock your sliding 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 door away from the pet door panel.
charley bar location

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:

where to trim adjustment pieces

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.

height extension piece

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.

What do I do if this door doesn't come in a size that will fit my window?

If none of the sizes will fit your window, you can a custom cat door that will fit your window track.

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?

There is a slight tint, but you can see through it.

Is it hard for really small pets to use?

The flap is very easy to push open so small pets have no trouble using it. It is rigid though, so if your pet is timid we would recommend the PetSafe Horizontal Cat Door for Windows.

Could this be used leading out to a catio?

Yes! In fact that is one of the more popular reasons customers get these doors.

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.