Pet Door Size Guide — Find the Right Cat Door or Dog Door
🐾 Find the Right Pet Door in 5 Steps
Tell us about your pet and installation — we'll recommend the exact right model instantly.
Cat door or dog door?
Select your unit then enter your pet's weight.
What are you fitting the door into?
Select the thickness of your installation.
How to Weigh & Measure Your Pet
Weigh Your Pet
Use your bathroom scales — weigh yourself first, then weigh yourself holding your pet. The difference is your pet's weight in kg or lbs.
Measure Chest Width
Measure the widest part of your pet's body — usually across the shoulders or chest. This ensures they can pass through comfortably.
Measure Shoulder Height
Measure from the top of your pet's shoulders down to the bottom of their chest. Always allow a little extra room for comfortable passage.
Pet Door Size Guide — Cats & Dogs
| Pet & Weight | Typical Breeds | Glass Fitting | Wood / PVC / Metal / Wall |
|---|---|---|---|
| 🐱 Cat Doors | |||
| Cat — Under 4kg | Kittens, Singapura, Devon Rex | Catwalk® G-CD | Catwalk® W-CD |
| Cat — 4kg – 7kg | Average domestic cats, British Shorthair, Burmese | Catwalk® G-CD | Catwalk® W-CD |
| Cat — 7kg – 10kg | Maine Coon, Ragdoll, Norwegian Forest Cat | Catwalk® G-SDD | Catwalk® W-SDD |
| Cat — 10kg+ | Very large cats — consider dog door range | Contact Our Team | Contact Our Team |
| 🐶 Dog Doors | |||
| Dog — Under 5kg | Chihuahua, Toy Poodle, Miniature Dachshund | Dogwalk® G-SDD | Dogwalk® W-SDD |
| Dog — 5kg – 15kg | Cocker Spaniel, Beagle, Border Collie, Corgi | Dogwalk® G-IDD | Dogwalk® W-DD |
| Dog — 15kg – 30kg | Labrador, Golden Retriever, German Shepherd, Boxer | Dogwalk® G-DD | Dogwalk® W-DD |
| Dog — 30kg+ | Great Dane, Saint Bernard, Mastiff, Irish Wolfhound | Contact Our Team | Contact Our Team |
⚠️ Wall installations: A fabricated tunnel extension is required to span the wall thickness. Contact our team for tunnel specifications.
Choosing by Door, Panel or Wall Type
🪟 Glass, Sliding & Double Glazed Doors
Glass fitting requires a glazier to cut the hole before toughening. Our glass fitting range suits single glazing, double glazing, sliding glass doors, bifold doors and laminated glass panels up to 32mm thick.
🪵 Wood & Timber Doors
Our wood fitting range suits standard timber doors from 11mm to 52mm thick. The self-lining tunnel profile closes up to your panel thickness automatically — no manual cutting required.
🔲 PVC, UPVC & Metal Doors
Our wood fitting range installs cleanly into PVC, UPVC and metal panels from 11mm to 52mm thick. The self-lining tunnel profile works perfectly without any additional cutting.
🧱 Wall Installations
Our wood fitting range can be installed through walls as well as doors. Because walls are significantly thicker than standard doors, a fabricated tunnel extension is required to bridge the gap.
Frequently Asked Questions — Pet Door Sizing & Installation
What size pet door do I need for my cat?
For most domestic cats between 3kg–7kg, the Catwalk® G-CD (glass) or W-CD (wood/PVC/metal) is the right choice. For larger breeds like Maine Coons and Ragdolls over 7kg, the G-SDD or W-SDD Maxi range is recommended. Use our 5-step size calculator above for an instant recommendation based on your cat's exact weight and measurements.
What size dog door do I need for a Labrador?
A Labrador typically weighs between 25kg–35kg. For Labradors up to 30kg, we recommend the Dogwalk® G-DD for glass installations or the W-DD for wood, PVC or metal doors. For larger Labradors over 30kg, contact our team directly — we are developing a new solution for extra large breeds and can advise the best current option for your dog.
Can I install a pet door through a wall rather than a door?
Yes — our wood fitting range can be installed through walls as well as doors. However, because walls are significantly thicker than standard doors, a fabricated tunnel extension is required to bridge the gap. Contact our team with your wall measurements and we'll advise on the correct tunnel specifications for your installation.
Can I install a pet door into a double glazed sliding door?
Yes — our glass fitting range is specifically designed for double glazed and sliding glass doors. The hole must be cut by a glazier before the glass is toughened. Our glass fitting doors suit glass from 4mm up to 32mm thick. No tunnel extension is required for glass installations.
What is the difference between a cat door and a dog door?
Cat doors and dog doors differ in flap size, opening dimensions and frame depth. Cat doors are designed for the lighter, more agile movement of cats, while dog doors are engineered for heavier daily use and larger body dimensions. We always recommend choosing a door specifically sized for your pet's weight and physical measurements for best performance and weather sealing.
How do I measure my pet for a pet door?
Measure the widest part of your pet's chest or hips (width) and from the top of your pet's shoulders to the bottom of their chest (height). Always measure with your pet standing up. Add approximately 25mm (1 inch) to both measurements to ensure comfortable passage — our calculator does this automatically.
Do Pet-Tek pet doors come in metric and imperial sizes?
Yes — our online size calculator supports both metric (kg and mm) and imperial (lbs and inches) measurements, making it easy for customers in New Zealand, Australia, the UK, the USA and beyond to find the right fit without manual conversion.
What if I'm still not sure which pet door to choose?
Our team is happy to help. Contact us with your pet's weight, breed, measurements and installation type and we'll recommend the exact right model for your situation — including tunnel specifications if needed.
Still Not Sure? Our Team Can Help.
Tell us your pet's weight, breed, measurements and door or wall type — we'll recommend the exact right model and tunnel specifications if needed.
