Pet Door Size Guide — Find the Right Cat Door or Dog Door

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.

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 with panels 5–36mm thick. For larger Labradors over 30kg, or for panels thicker than 36mm, contact our team for the best current option.

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.

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.

The W-DDW and W-DDB wood fitting dog doors are rated for door panels from 5mm to 36mm thick. For panels thicker than 36mm, Pet-Tek International is currently developing a tunnel extension system. Contact our team to register your interest or to discuss current options for your installation.

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.

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.

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.

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.