How to Choose the Right Size Cat Flap for Your Furry Friend

Choosing the right cat flap isn’t just about brand or features — it starts with sizing. An ill-fitting flap can make your cat uncomfortable, cause them to avoid using it, or even lead to injury. Whether you’re shopping for a kitten, an adult cat, or a chunky fluffball, this guide will help you pick the purr-fect fit.

Why Size Matters

A flap that’s too small might make your cat feel trapped. One that’s too big can let in cold drafts or even other animals. The ideal flap allows your pet to pass through with ease, without too much effort or space.

How to Measure Your Cat

Use a soft tape measure and follow these three quick steps:

• 1. Shoulder Width: Measure the widest point across your cat’s shoulders.
• 2. Height from Belly to Shoulder: This ensures the flap will be at a comfortable height to step through.
• 3. Total Body Height: Measure from the ground to the top of their back — this helps set the right installation height.

Add a few extra centimetres for comfort, especially if your cat is still growing.

Size Guidelines

While every flap is different, here are some general sizing ideas:

• Small cats & kittens: Flap opening 140mm x 120mm
• Average adult cats: Flap opening 160mm x 150mm
• Large breeds (like Maine Coons): Flap opening 180mm x 160mm or a small dog flap

Tip: Always check the flap opening size, not just the frame.

What About Dogs?

If you have a small dog or multi-pet home, you may want to consider a larger flap that works for both. Just make sure your cat can still reach and operate the flap easily.

Features to Consider Alongside Size

• 4-way locks for flexible access control
• Microchip compatibility to prevent intruder animals
• Magnetic closures to reduce draughts
• Silent operation to help nervous pets feel comfortable

Final Thoughts

The right size cat flap makes life easier for both you and your pet. Take the time to measure carefully and choose a flap that suits their size, personality, and your home setup.

Need help choosing? Explore our full collection of cat flaps for every breed and door type at catflaps.co.uk.

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