Best Narrow Sliding Glass Door Pet Inserts for Small Spaces
The best narrow sliding glass door pet insert depends on your door-track measurements, pet size, and whether you need a removable or permanent installation. For cats and small dogs, the Hakuna Pets Small insert has a compact flap; the Petoasis insert is designed specifically for cats. PetSafe offers removable panels for larger dogs, while Eillion is an option for buyers who want an openable panel and can drill into the frame. Measure your track and available opening before choosing: these products are pet-door inserts, not replacement sliding glass doors.
| Product | Best for | Key fit or flap detail |
|---|---|---|
| Hakuna Pets Small | Cats and small dogs | 6.7 × 9-inch flap; up to 20 lb |
| Petoasis | Cat owners | 7.7 × 8.6-inch flap; adjustable height |
| PetSafe Large | Large dogs | Flap for pets up to 100 lb |
| PetSafe XL | Extra-large dogs | Flap for pets up to 220 lb |
| Eillion Large | Buyers needing an openable panel | 14.8-inch glass-door width; drill installation |
Hakuna Pets Small Tempered-Glass Insert
Best for: Cats and small dogs in homes where a compact flap and a rental-friendly installation matter. Its 6.7-by-9-inch flap is listed for pets up to 20 pounds, and the tempered-glass insert drops into an aluminum patio-door track.
A spring-jack pressure mount allows installation without drilling; included brackets can be used for a permanent installation. A metal locking panel closes off pet access. The sliding door can still open normally, according to the product details.
Limitation: The small flap and 2-inch step-over are not intended for medium or large dogs. Measure your pet’s width and shoulder height before selecting this size.
Petoasis Low-Profile Cat Door Insert
Best for: Cat owners who want a removable, no-cut panel with an insulated rigid flap. The flap opening measures 7.7 by 8.6 inches, and the panel adjusts from 76⅜ to 80⅝ inches tall. The product specifies a minimum track width of 0.8 inches and says the insert occupies 12 inches of track space.
The flap has felt lining and magnetic closure, and a four-way safety lock is included. Its transparent, scratch-resistant flap may suit cats that benefit from seeing through the door before passing through.
Limitation: This is a cat-focused product. Check the opening dimensions and track requirements against your door and pet rather than assuming the adjustable height guarantees a fit.
PetSafe Large Sliding Glass Pet Door
Best for: Renters or homeowners with a large dog who want a removable, one-piece panel without cutting into a wall or door. The flap measures 10¼ by 16⅜ inches and is designed for pets up to 100 pounds.
The panel adjusts from 75⅞ to 80 11/16 inches to fit the stated door-frame height range. Its one-piece installation is described as easy to remove and take along when moving, making it a practical choice when permanent changes are not suitable.
Limitation: Its height range is narrower than some other options, so measure from the correct points on the track before ordering. The listed pet limit and flap dimensions may also rule it out for larger dogs.
PetSafe XL Sliding Glass Pet Door
Best for: Owners of extra-large dogs who need a substantially taller and wider flap than the standard large panel offers. Its opening is 13 11/16 by 23¾ inches, and the product is designed for pets up to 220 pounds.
Like the PetSafe Large model, this one-piece panel adjusts from 75⅞ to 80 11/16 inches and is described as suitable for rental homes because it installs without cutting into walls or doors. Choose it over the Large version when your pet needs the larger opening.
Limitation: The larger flap takes up more panel area. Confirm that its dimensions and your available track space work for your household.
Eillion Openable Large Dog Door Panel
Best for: Buyers who want an openable pet-door panel and have a compatible aluminum sliding-door frame. Its adjustable height spans 75⅞ to 81 inches, and the listed glass-door width is 14.8 inches.
The product features an all-metal frame and panel. Its opening design is intended to make it easier for people to move items through the doorway. Measure from the top track to the inner bottom track to check the required height.
Limitation: Installation requires drilling holes in the door frame. The swing direction is fixed by installation side: left-side installation opens inward, and right-side installation opens outward. Avoid this option if you need a no-drill or adjustable-swing setup.
Buying Guide: How to Choose a Narrow Sliding Glass Door Insert
What should you measure before buying?
Measure the height from the top track to the inner bottom track, then compare it with the insert’s stated adjustment range. Measure the track width and the space the panel will occupy as well. For pet fit, compare the flap opening with your pet’s width and shoulder height. A stated weight limit alone does not confirm that the opening will be comfortable.
Which option works best for a rental?
Look for a pressure-mounted or removable panel if you want to avoid permanent changes. The Hakuna Pets Small and Petoasis products describe no-drill installation, while PetSafe describes its one-piece panel as removable and suitable for rental homes. Eillion requires drilling, so it is a less suitable choice when frame alterations are not allowed.
How do flap size and step-over affect the choice?
Choose a flap that gives your pet enough room to pass through and check the step-over height for your pet’s mobility. The Hakuna Small model lists a 2-inch step-over; its medium version lists 3.9 inches. Larger openings suit bigger pets, but require checking the available panel and track space.
Does an insert replace the sliding glass door?
No. These products are pet-door panels or inserts designed for sliding-door tracks. Confirm how the insert affects your existing slider’s operation and how you will secure the opening when the pet door is not in use.
Frequently Asked Questions
Can I install a pet insert in a narrow sliding glass door?
Possibly, if the insert’s height, track width, and occupied track space fit your door. Compare exact measurements before purchasing; the term “narrow” does not specify a standard door size.
Which listed insert is best for cats?
The Petoasis is specifically designed for cats and has a 7.7-by-8.6-inch flap. The Hakuna Pets Small is another option for cats and small dogs, with a 6.7-by-9-inch flap.
Which product is intended for the largest dogs?
The PetSafe XL is listed for pets up to 220 pounds and has a 13 11/16-by-23¾-inch flap.
Which option requires drilling?
The Eillion panel requires drilling holes in the door frame. The other listed options describe removable, pressure-mounted, or no-cut installation approaches.