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Pet Door Cut-Out Sizes & Trade Specifications
Every Catwalk® and Dogwalk® cut-out diameter, glass thickness range, panel thickness and flap size on one page. Written for glaziers quoting a job — and for homeowners who need something to send their glazier before anyone orders glass.
If you are quoting a pet door into glass, one number decides everything: the cut-out diameter. Order the panel with the wrong hole and the job is scrapped, because a cut hole cannot be moved or resized. Every glass fitting model in the range uses a round cut-out — four diameters cover the lot.
Glass fitting models
Round cut-out, self-lining, clamps from both sides — no external screws. The two halves draw together through the hole, so the same door suits any glass thickness within its range without packers or adaptors.
| Model | Cut-out ⌀ | Glass thickness | Flap panel (W × H) | Usable opening (W × H) |
|---|---|---|---|---|
| G-CDC / G-CDW Original cat door | 245 mm | 3–10 mm | 165 × 193 mm | 165 × 180 mm |
| G-SDDSLC / G-SDDSLW Maxi slim line | 267 mm | 3–21 mm | 187 × 203 mm | 187 × 190 mm |
| G-SDDC / G-SDDW / G-SDDB Maxi dual glaze | 267 mm | up to 28 mm | 187 × 203 mm | 187 × 190 mm |
| G-IDDSLC / G-IDDSLW Intermediate slimline | 320 mm | 4–13 mm | 216 × 250 mm | 216 × 237 mm |
| G-IDDC / G-IDDW / G-IDDB Intermediate dual glaze | 320 mm | up to 32 mm | 216 × 250 mm | 216 × 237 mm |
| G-DDSLC / G-DDSLW Medium dog door slimline | 385 mm | up to 20 mm | 270 × 313 mm | 270 × 300 mm |
| G-DDC / G-DDW / G-DDB Medium dog door dual glaze | 385 mm | 3–32 mm | 270 × 313 mm | 270 × 300 mm |
Timber, PVC and metal fitting models
Rectangular cut-out, marked from the template supplied in the box, then the two halves screw together through the panel and line the cut as they go. No separate lining required.
| Model | Panel thickness | Flap panel (W × H) | Usable opening (W × H) |
|---|---|---|---|
| W-CDW / W-CDB Slim line cat door | 11–30 mm | 155 × 170 mm | 155 × 157 mm |
| W-CDTW / W-CDTB Cat door, tunnel | 11–52 mm | 155 × 170 mm | 155 × 157 mm |
| W-MCDW Multi-magnetic cat door | 11–52 mm | 155 × 170 mm | 155 × 157 mm |
| W-SDDW / W-SDDB Small dog door, slim line | 11–30 mm | 180 × 240 mm | 180 × 227 mm |
| W-SDDTW / W-SDDTB Small dog door, tunnel | 11–52 mm | 180 × 240 mm | 180 × 227 mm |
| W-DDW / W-DDB Medium dog door | 5–36 mm | 270 × 320 mm | 270 × 307 mm |
The tunnel models carry a self-lining tunnel that adjusts to the panel depth, so one part number covers everything from a hollow-core door to a weatherboard wall without cutting the liner to length.
Quoting a glass job — the order that avoids scrapped panels
1Confirm the glass can't be cut in place
Toughened and laminated glass cannot be cut or drilled after manufacture, and neither can a sealed double-glazed unit. In most Australian homes that means a replacement panel rather than a hole in the existing one. Older annealed glass can sometimes be core-drilled in place — check the toughening stamp in the corner before assuming either way.
2Take the flap height off the pet, not the door
The bottom of the opening should sit level with the animal's belly — 100 to 150 mm off the floor for a cat, chest height for a dog. Confirm this with the customer before the panel is ordered, because it fixes where the hole goes and the hole cannot be moved afterwards.
3Check the finished floor level on both sides
A deck or path sitting lower than the internal floor changes the step-over height on one side only. It is the most common reason a correctly specified door goes unused.
4Give the fabricator the diameter, not the model name
Cut-out diameter and hole position, in writing. The model name means nothing at the fabricator, and a hole in the wrong place is a new panel.
Trade supply
The Catwalk® and Dogwalk® range is manufactured by Pet-Tek International and stocked in Australia by CR Laurence Australia Pty Ltd, who supply, invoice and fulfil every order placed on this site. Stock is held locally rather than shipped per order, so if you already hold a CRL account you are buying through a supplier you know. For trade pricing and account enquiries, get in touch here, or send us the job if you want a second opinion on a specification before you quote it.
Every door is UV-stabilised high-impact polycarbonate with a full brush seal and a four-way lock as standard, and the flap is a replaceable part — genuine replacement flaps are stocked for every model, so a worn flap is not a new door.
Glass fitting dog doorsGlass fitting cat doors
Common questions
What size hole do I need to cut for a pet door in glass?
Four diameters cover the whole glass fitting range: 245 mm for the original cat door, 267 mm for the Maxi pet door, 320 mm for the intermediate dog door, and 385 mm for the medium dog door. All are round cut-outs. The exact diameter for the model you are fitting is in the table above and in the instructions supplied with every door.
What is the cut-out diameter for a glass cat door?
What glass thickness do these doors suit?
It varies by model. The original cat door takes 3 to 10 mm. The Maxi slim line takes 3 to 21 mm and the Maxi dual glaze up to 28 mm. The intermediate slimline takes 4 to 13 mm and the intermediate dual glaze up to 32 mm. The medium dog door slimline suits glass up to 20 mm and the dual glaze version 3 to 32 mm, which covers standard double-glazed units. The full breakdown is in the glass fitting table above.
Can the hole be cut in the existing panel?
Only if the glass is annealed. Toughened glass shatters if cut or drilled after manufacture, laminated glass cannot be core-drilled cleanly, and a sealed double-glazed unit has to be remade rather than modified. Check for the toughening stamp in the corner of the panel first. In most Australian homes the panel is replaced with one made with the hole already in it.
Is the cut-out square or round?
Round for every glass fitting model — a single continuous cut with no corners to crack from, which is also the shape fabricators prefer. Timber, PVC and metal fitting models use a rectangular cut-out marked from the template supplied in the box.
How high off the floor should the opening be?
The bottom of the opening should sit level with the animal's belly — 100 to 150 mm off the floor for a cat, at chest height for a dog. Fixing this before the panel is ordered matters more than any other detail on the job, because the hole cannot be repositioned afterwards.
Do the doors need packers for different glass thicknesses?
No. The two halves clamp together through the cut-out and self-line, so any glass within the model's stated range is accommodated by the fixing itself. There are no adaptors, spacers or thickness-specific variants to order.
Where do I buy these in Australia?
The range is stocked in Australia by CR Laurence Australia Pty Ltd, who supply, invoice and fulfil orders placed on this site. If you already hold a CRL trade account, that is the supplier behind every order. You can also order directly from the product pages here.
What if the customer moves house or the glass is replaced later?
The whole unit swaps out — undo the four screws, lift it free, fit it into the new panel. No glazier is needed for that step; a glazier is only involved when glass itself has to be cut or fitted. It is worth telling the customer at quote stage, because it changes how they think about the cost.
Pet-Tek International has designed and manufactured Catwalk® and Dogwalk® pet doors since 1999. If a specification is borderline — an unusual panel, a very large animal, a thickness at the edge of a model's range — send us the details and we will tell you plainly whether it will work.