Best Glass Fitting Cat & Dog Doors for Glass Doors & Sliding Panels
Looking for the best pet door for a glass door, ranch slider, or double-glazed panel? Glass fitting pet doors install directly into the glass itself: no frame cutting, no wall modification. This guide covers how glass fitting cat doors and dog doors work, what makes Pet-Tek’s Catwalk® and Dogwalk® range different from rectangular-cut alternatives, and how to choose the right model for your glass thickness, door type, and pet size across New Zealand, Australia and the UK. For a step-by-step installation walkthrough, see our guide to fitting a cat door in glass.
- Pet doors for glass doors use a round cut-out: faster for glaziers, no stress corners, cleaner than rectangular alternatives.
- Compatible with glass from 3mm to 32mm thick: single glazing, double glazing, ranch sliders and sliding door panels.
- Both Catwalk® cat doors and Dogwalk® dog doors include a 4-way locking dial, full brush seal and 3-year warranty.
What Is a Glass Fitting Pet Door?
A glass fitting pet door installs directly into a glass panel, whether that’s a single glazed window, a double glazed unit, a sliding door, or a fixed glass panel. Unlike wood fitting doors which install through a timber or PVC door, glass fitting models require a professional glazier to cut a hole in the glass and fit the door unit directly into it.
The result is a clean, professional finish that is flush with the glass surface: no frames, no tunnels, and no visible housing on either side of the panel. For homes with glass sliding doors or floor-to-ceiling windows, a glass fitting pet door is often the only practical option.
Why the Cut-Out Shape Matters
Most glass fitting pet doors on the market require a rectangular cut-out. This creates two problems: rectangular cuts are significantly harder for glaziers to execute cleanly, and sharp corners in glass create stress points that can cause cracking over time.
Pet-Tek’s entire glass fitting range (both Catwalk® cat doors and Dogwalk® dog doors) uses a round cut-out profile. A round hole is faster and easier for glaziers to drill, eliminates stress corners, and results in a cleaner, more professional installation. It’s one of the core reasons glaziers across New Zealand, Australia, the UK and beyond prefer the Pet-Tek range over competitors. For the full installation process, read our how to fit a cat door in glass guide.
Glazier tip: A round cut-out can be drilled in a fraction of the time it takes to cut a rectangle. For trade installers working across multiple jobs, this adds up to significant time and cost savings, and a cleaner result every time. The Glass & Glazing Federation recommends always using a qualified glazier for any glass cutting work.
Glass Thickness Compatibility
One of the most common questions we receive is: “Will this door fit my double glazing?” The answer for Pet-Tek glass fitting models is almost always yes. Our range accommodates glass panels from 3mm up to 32mm thick: covering single glazing, double glazing, laminated glass, and toughened panels.
| Glass Type | Typical Thickness | Compatible |
|---|---|---|
| Single glazing | 3mm – 6mm | ✓ Yes |
| Double glazing | 14mm – 28mm | ✓ Yes |
| Laminated glass | 6mm – 12mm | ✓ Yes |
| Toughened/tempered | 6mm – 12mm | ✓ Yes (must be cut before toughening) |
| Sliding glass doors | 6mm – 12mm | ✓ Yes |
Catwalk® Glass Fitting Cat Doors
The Catwalk® range is purpose-built for cats, with flap dimensions, opening heights, and tunnel depths specifically designed around feline movement and behaviour. Key features include:
- Virtually unbreakable UV-stabilised polycarbonate flap, the same material used in aircraft windows
- Whisper-quiet brush seals: no rattling, no drafts
- 4-way manual locking: in only, out only, open both ways, or fully locked
- UV-stabilised materials that will not cloud, crack, or warp in any climate
- Round cut-out for fast, clean glazier installation
- Available in multiple sizes to suit cats of all breeds
View the full Catwalk® glass fitting cat door range →
Dogwalk® Glass Fitting Dog Doors
The Dogwalk® range applies the same engineering philosophy to dog doors: built for heavier daily use, larger body dimensions, and the additional wear that comes with a dog’s more forceful movement through the flap. Key features include:
- Heavy-duty UV-stabilised polycarbonate flap, the same material used in aircraft windows, engineered for repeated high-impact use
- Flap design allows a wider swing arc, reducing hinge stress and extending flap life
- Suits glass panels from 3mm to 32mm, the widest compatibility range in its class
- 4-way manual locking for full access control
- Available in sizes from small breeds up to large dogs
- 3-year manufacturer’s warranty
View the full Dogwalk® glass fitting dog door range →
How to Choose the Right Glass Fitting Door
Choosing the right glass fitting pet door comes down to three things: your pet’s size, your glass type, and your installation location. Use the comparison below as a starting point, or read our full cat flap advice guide for a detailed walkthrough. Whichever model the finder lands on, the weather engineering is the same across the range: internal draft angles shaped so driven rain drains out of the body, and a flap machined to next to zero tolerance under a full brush seal.
Choose Catwalk® if…
- Your pet is a cat of any breed or size
- You want a multi-magnetic selective entry option
- You need a smaller flap opening to deter other animals
- You have single or double glazed panels
Choose Dogwalk® if…
- Your pet is a dog, any size from small to large
- You need a wider, taller flap opening
- Your dog uses the door multiple times per day
- You have glass panels up to 32mm thick
Not sure which size is right for your pet? Use our interactive size guide: enter your pet’s weight and door type and we’ll recommend the exact right model. Find My Pet Door →
The Full Glass Fitting Range — Model Comparison
Every model in the Pet-Tek glass fitting range, side by side. Click any model for full specifications, dimensions and downloads:
| Model | For | Glass Thickness | Flap Size | Cut-Out |
|---|---|---|---|---|
| G-CDC / G-CDW | Cats, original | 3–10mm | 193×165mm | 245mm dia |
| G-MCDW | Cats, selective entry | 3–26mm | 170×155mm | 245mm dia |
| G-SDDSLC / G-SDDSLW | Large cats & small dogs, slim line | 3–21mm | 203×187mm | 267mm dia |
| G-SDDC / G-SDDW / G-SDDB | Large cats & small dogs, dual glaze | 3–28mm | 203×187mm | 267mm dia |
| G-IDDSLC / G-IDDSLW | Small–medium dogs, slim line | 4–13mm | 216×250mm | 320mm dia |
| G-IDDC / G-IDDW / G-IDDB | Small–medium dogs, dual glaze | 4–32mm | 216×250mm | 320mm dia |
| G-DDSLC / G-DDSLW | Medium–large dogs, slim line | 4–20mm | 270×313mm | 385mm dia |
| G-DDC / G-DDW / G-DDB | Medium–large dogs, dual glaze | 3–32mm | 270×313mm | 385mm dia |
Our Verdict — Which Glass Fitting Door Is Best?
Best for most cats: the G-CDC (clear) or G-CDW (white), the original Catwalk® glass fitting cat door. Simple, proven, and the fastest install for standard single glazing. Best for double glazing: the maxi dual glaze models for cats and small dogs (glass to 28mm), or the Dogwalk® standard dual glaze for medium to large dogs (glass to 32mm). Best for keeping other cats out: the G-MCDW, battery-free selective entry for glass panels up to 26mm. Best for small to medium dogs: the intermediate range: slim line for standard sliders, dual glaze for double glazing. If in doubt, measure your pet, measure your glass, and use the door finder; it narrows the range to the right model in under a minute.
Installation — What to Expect
Glass fitting pet doors must be installed by a qualified glazier. The process is straightforward for any experienced tradesperson. For a full step-by-step guide with photos and glazier tips, see our how to fit a cat door in glass guide. The basic process is:
- Measure and mark the cut-out position on the glass panel
- Drill the round cut-out using a core drill bit
- Clean and dress the cut edge
- Insert the Pet-Tek door unit and secure with the retaining ring
- Apply silicone seal around the outer ring if required
- Round cut-out size: 245mm, 267mm, 320mm or 385mm depending on model
- Your glass type & thickness: single glazed, double glazed or toughened
- The fitting instructions from the box — glass range and clamping detail
Any qualified glazier can do this — most complete it in under an hour.
Most glaziers complete the installation in under an hour. The round cut-out profile means no corner grinding, no stress fractures, and a clean result first time. If you need help finding a local glazier familiar with Pet-Tek products, contact us and we’ll point you in the right direction.
Frequently Asked Questions
Not sure which door fits your pet?
Use our interactive size guide: enter your pet’s weight and door type and we’ll recommend the exact right model for your glass panel.
Find My Pet Door →
