Thin Cat Door for Windows
- Cat Door
- Plastic
- Magnetic
- Cat, Dog, Small Animal
- More reviewed than 76%
Works well as a sliding door or thin wall pet pass, poorly as a swap for a solid exterior door cat flap.
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How it ranks among the 51 cat doors we track
4.4★ across 2,300 Amazon ratings, Bayesian-smoothed toward the category average.
2,300 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Modest tracked demand last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 51 cat doors we track - how the scorecard works · full cat doors data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
A magnetic-close flap sized for sliding doors and thin walls, not standard exterior doors. Fits mounting surfaces between 0.1 and 0.78 inches thick, so measure the door or wall panel before ordering. Built for cats and small dogs sharing one opening.
Most cat doors are cut for a 1.5 inch exterior door slab; this one is not. It targets the narrow gap of a sliding glass door track, screen door, or interior wall cutout, which is a different job entirely. The listing's mention of a four way lock suggests the flap can be fixed open, fixed shut, or left to swing freely.
- Outer frame 7.76 x 7.5 x 0.78 in
- Mounts to surfaces 0.1 to 0.78 in thick
- Magnetic flap closure
- ABS plastic frame construction
Who it's for
Apartment and condo owners with sliding glass doors, screen doors, or thin interior walls who want a cat or small dog to pass through without cutting a standard door. Not for anyone with a thick exterior door, since the frame only spans up to 0.78 inches.
Strengths and trade-offs
Drawn from this product's published specifications.
- Fits thin surfaces standard cat doors cannot mount to
- Magnetic closure keeps the flap shut automatically
- Rated for cats, small dogs, and small animals
- Will not fit a standard solid exterior door
- Frame tops out at 0.78 inches, a hard limit
Performance notes
The magnetic closure pulls the flap shut after the pet passes, and the frame clamps around whatever thin surface it is mounted to rather than being screwed into a thick door core. Because the compatible thickness tops out at 0.78 inches, it seats into the gap left by a sliding door track or a hollow interior wall rather than a solid slab.
Specifications
| Brand | Thin |
|---|---|
| Dimensions & fit | |
| Dog Breed Size | Extra Small, Medium, Small |
| Construction & materials | |
| Material Type | Plastic |
| Frame Material | Acrylonitrile Butadiene Styrene (ABS) |
| Color | White |
| Compatibility & installation | |
| Maximum Compatible Thickness | 0.8 inches |
| Smart Home Compatibility | Not Smart Home Compatible |
| Included components | |
| Unit Count | 1 |
| Other details | |
| Closure Type | Magnetic |
| Pet Type | Cat, Dog, Small Animal |
| Customer Reviews | {'ratings_count': '2,307', 'stars': '4.4'} |
| Manufacturer Part Number | Lessmon Screen Cat Door |
| Target Audience | Cats; Dogs (Small, Medium) |
| Asin | B0C818453F |
| Manufacturer | Lessmon |
| Best Sellers Rank | #10,044 in Pet Supplies (See Top 100 in Pet Supplies) #19 in Cat Doors |
| Model Number | Medium |
How it compares
This product against the closest alternatives we track in cat doors.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Thin Cat Door for WindowsThis product | 4.4 / 5 | 2,300 | 3.8 / 5 |
| Purrfect Portal Meow Manor® Cat Door Interior DoorPurrfect | 4.9 / 5 | 7,451 | 4.7 / 5 |
| PetSafe Interior Cat DoorPetSafe | 4.4 / 5 | 16,272 | 4.4 / 5 |
| Ideal Pet Products Cat Flap Door with 4 Way LockIDEAL | 4.6 / 5 | 2,900 | 4.2 / 5 |
| Dog Door for Screen Doordog | 4.5 / 5 | 3,600 | 4.1 / 5 |
Similar cat doors from other brands
Questions about the Thin cat doors
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What surfaces does this thin cat door fit?
Any wall, window, or sliding door track between 0.1 and 0.78 inches thick. It is not designed for standard solid exterior doors.
Does the flap close on its own?
Yes, the closure is magnetic, so the flap swings shut after the pet passes through.
What size pets can use this door?
The listing rates it for cats, small animals, and small to medium dog breeds.