Four quick questions about your pet and the doorway, and we'll match you
to the right model — with the flap size, cut-out and glass thickness you'll
need to give your glazier.
Not sure how to measure?
Three measurements decide almost every pet door choice. None of them need
anything more than a tape measure.
Your pet's shoulder heightMeasure from the floor to the top of the shoulder while they're standing — the withers, not the head. Also measure from the floor to the bottom of their chest: that second figure sets the height you fit the door at, and it's why the flap doesn't need to be as tall as the whole animal.
Your pet's widthMeasure across the widest point, usually the chest or hips. Compare that to the flap width, and allow a little room either side.
The panel or glass thicknessFor timber, measure the edge of the door. For glass, ask your glazier — single glazing is usually 3–10 mm, double glazed units are much thicker and need a door rated for them.
Two checks against whatever model you land on: the flap should be at least
your pet's widest point plus 25 mm across, and at least their
body depth plus 25 mm tall — body depth being shoulder height
less chest height off the ground. Pets stop using a door that's a squeeze, and a
flap that's slightly too big is never a problem, so if you are between sizes, go up.
Common questions
What size dog door do I need for my dog?
Measure three things: your dog's shoulder height, their width at the widest point, and the height from the floor to the bottom of their chest. The first two point you at a model; the third sets the height you fit it at. As a guide: our Intermediate range (216 mm wide flap) suits small to medium dogs, the full-size Dogwalk® glass door (270 mm) suits medium to large dogs, and the wood fitting dog door matches that 270 mm width and is the tallest in the range at 320 mm. The flap is fitted with its base level with your dog's chest, so it doesn't need to be as tall as the whole dog — they step through at walking height. If your dog is between sizes, go up.
Can a pet door go into double glazing?
Yes, but only with a door rated for the thickness. Our dual glaze models handle glass up to 32 mm, which covers most double glazed units. The Original Cat Door fits 3–10 mm and is for single glazing only — putting it in the wrong panel is the most common mistake people make. Your glazier will tell you the exact thickness of your unit.
Do I need a glazier, or can I fit it myself?
Glass fitting doors need a glazier, because the hole is cut into the glass — usually a new pane is made with the cut-out already in it. Wood fitting doors are a straightforward DIY job with the template supplied. Either way you can find someone local in our installer directory.
Can I put a pet door in a sliding glass door?
Yes — this is one of the most common installations in Australia. The door glazes into the fixed glass panel rather than the sliding one, so the slider still works normally. Your glazier makes up a new panel with the round cut-out already in it and swaps it in. Measure the glass thickness first, because that decides which model you need.
What's the difference between a slimline and a dual glaze door?
It's the depth of the door body, which decides what glass it can clamp onto. Slimline models suit thinner glass and narrow glazing rebates; dual glaze models are deeper and take much thicker panels, including double glazed units. The flap opening is identical between the two — only the body differs, so your pet notices no difference.
My wall or door is thicker than 30 mm — what do I use?
A tunnel model. The tunnel versions of the cat door and small dog door extend to suit panels and walls from 11 mm right up to 52 mm, so they handle thick timber doors, brick cavity walls and insulated panels that the standard models can't reach through.
Still not sure? Ask us
Send us your pet's measurements and what you're fitting into, and we'll tell
you exactly which model to order. It's much cheaper than returning the wrong one.
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