Lessmon Cat Flap for Cats and Small Dogs

Looking for a practical cat door to give your cat quiet, independent access through a window or sliding door? This weatherproof cat flap is designed for thin doors and walls so cats can slip in and out without you having to open the door, helping reduce stress for a cat that prefers routine and freedom.

The flap offers a four-way lock operated by simple slide switches so you can choose Free In & Out, Fully Locked, Out Only or In Only to manage access at different times of day. A magnetic alignment and sealing strip help keep out draughts, insects and unwanted smells, while the rigid plastic construction provides a durable, easy-to-clean surface. Its low-profile, tunnel-free design is made to fit into narrow frames found on many windows, wooden doors and sliding glass doors.

Suitable for medium and smaller-built adult cats, and also usable for small dogs where applicable, it works well for owners who want controlled outdoor access, to keep neighbourhood animals out, or to separate areas of the home. Before fitting, compare your door or frame to the product opening to be sure a comfortable passage is available for your cat.

Key Features

• Four-way lock with slide switches – choose Free In & Out, Fully Locked, Out Only or In Only for flexible access control.
• Weatherproof seals and magnetic flap – reduces draughts, blocks insects and helps limit odours between spaces.
• Low-profile, tunnel-free design – fits narrow window and sliding-door frames without bulky tunnel parts.
• Sturdy plastic construction – durable and simple to clean for long-term use.
• Includes templates and fittings for simple installation into common door and window types.

Frequently Asked Questions

Which pets is this door suitable for?

Suitable for cats and small dogs whose waist circumference is shorter than 50cm. Flap measures 17 x 16cm and the outer frame is approximately 19.7 x 19cm.

Can this be fitted to windows and sliding doors without cutting?

Yes. The panels are only 2cm thick and fit windows, wooden doors and sliding glass doors. There is no tunnel part, so cutting is not required for many installations.

How does the lock system work?

A 4-way lock operated by sliding switches allows Free In & Out, Fully Locked, Out Only or In Only modes, so you can control your pet’s access and keep stray animals out.

Is the flap weatherproof and does it stop drafts or bugs?

Yes. A sealing strip and magnetic alignment help keep out bugs and litter odours, and reduce loss of cold air in summer and heat in winter.

What is included and is installation difficult?

Installation is simple. The package includes detailed instructions with templates, 8 screws with caps and double-sided tapes to help you fit it to your door or window.

Check the recent prices for Lockable Cat Door for Windows and Doors below.