11 photos
Door-Mounted Pet Door
A made-to-order pet door with replaceable service parts, multiple frame colors and configurations for a more precise, lasting fit.
Choose your size →Beyond standard sizing
Custom-Size Dog Doors
When none of the 11 standard sizes fits the animal or opening, a custom configuration may be appropriate.
4 matching products
Configure the right fit
Choose the installation model first, then verify pet size, rough opening, frame dimensions, finish and flap package.
11 photos
13 photos
Wall-Mounted Pet Door — 4–10 in. Walls
A durable, weather-sealed pet door engineered for a secure through-wall installation and available in a wide range of sizes.
Choose your size →
8 photos
In-Glass Pet Door
A made-to-order pet door with replaceable service parts, multiple frame colors and configurations for a more precise, lasting fit.
Choose your size →3 photos
Kennel Pet Door
A made-to-order pet door with replaceable service parts, multiple frame colors and configurations for a more precise, lasting fit.
Choose your size →Buyer's guide
Choosing custom-size dog doors
Start from the needed flap opening, not the frame exterior. The custom-size calculator converts between flap, rough-opening, tip-to-tip and cover dimensions using the manufacturer’s ordering relationships.
Custom dimensions should be verified before production. Use decimal inches in the calculator and include the installation type, wall depth and load direction in the order notes.
Buying guidance
How to choose custom-size dog doors
Use a custom opening only after comparing all 11 standard sizes and deciding whether the required dimension is flap opening, rough opening or frame tip-to-tip.
Custom-Size Dog Doors are appropriate when the animal or an existing opening cannot be served responsibly by the 11 standard flap sizes. Custom should not be the first shortcut around careful measuring. Identify what the submitted width and height represent—clear flap, rough opening or frame tip-to-tip—and keep that basis attached to every note, calculation and installer discussion. A number without its dimensional basis is not an order-ready measurement.
Buying guidance
Fit the pet, then fit the frame
Start from the pet’s required clear passage and a comfortable step-over. The custom calculator translates between dimensional bases using the manufacturer relationships.
Measure the pet, determine a comfortable clear opening and compare the complete standard matrix before entering custom dimensions. The calculator converts between flap, rough-opening, tip-to-tip and cover relationships for planning. Recheck decimal values and translate fractions consistently. For oversized requests beyond the published pricing table, the site uses an area-based estimate from the selected Giant reference configuration; the order should retain that estimate label rather than presenting it as a published manufacturer rate.
Dog Doors Depot carries 11 standard flap sizes from Small Medium through Giant, including tall intermediate sizes that separate height from width. Use the individual animal rather than the label as the decision-maker. After the clear opening is selected, compare the exact product variant because model families can use different frame, tunnel and cutout relationships. If every standard choice creates a meaningful compromise, use the custom-size workflow and keep the submitted dimensional basis attached to the order.
Buying guidance
Plan the installation before ordering
Confirm the custom frame footprint and rough opening with the installer before production. Include wall depth, surface type, frame orientation and load direction where applicable.
Custom products demand a custom preflight. Ask the installer to verify the finished wall depth or door construction, the proposed mounting height, the complete rough opening and the outer frame clearance. In-glass requests also need the glass professional to review the cutout information before fabrication. Include frame finish, flap count, wall tunnel family and cover orientation in the review so the dimension is not approved in isolation.
Buying guidance
Weather, service and long-term use
Custom dimensions still use the selected model, finish and flap package. Oversized pricing above the published table is an area-based estimate and should be treated as such on the order.
Save the final approved drawing, dimensional basis, selected configuration and order record with the installation documents. Custom flaps and covers may need the same exact information for future service. Inspect and maintain the door like a standard unit, but do not assume a standard replacement part will fit a custom frame. Confirm every service component against the recorded custom dimensions before ordering.
Buying guidance
Mistakes to avoid
Do not enter the hole size as the flap size, mix fractional and decimal notes without verification, or assume a custom frame can ignore structural limits.
A strong preflight is deliberately repetitive: measure again, check the dimensional label, compare both faces of the opening and read the exact manual. Confirm that the host door, wall, screen, glass or kennel panel remains safe and functional after the cutout. Record uncertainty instead of converting it into a guess. If structure, utilities, ratings, glass type or water management are unclear, pause the product decision and have the appropriate installer or trade verify the condition. That short review is less expensive than correcting an incompatible made-to-order frame.
Buying guidance
From a shortlist to an order-ready configuration
Move from shortlist to order only after four checks agree. The pet fits the clear opening; the building can accept the rough opening and full frame; the selected model matches the surface and thickness; and the flap, finish, cover and accessory choices match the intended use. Save the product page and model instructions with a labeled measurement sheet. For multiple openings, give each location its own ID and configuration. Review every line before submitting because made-to-order dimensions and options should not be inferred from another opening or corrected after fabrication begins.
Read the finished configuration back as a complete sentence before approving it: model family, named size or custom dimensions, measurement basis, frame finish, flap count, installation surface, finished thickness and mounting location. Then compare that sentence with the cart, worksheet and installer scope. This catches a correct measurement attached to the wrong model or a correct product attached to the wrong opening. When two pets share the door, confirm the widest body, tallest shoulder and lowest comfortable step-over still work together. Photograph the taped frame outline and keep that image with the order so the installer can verify placement before cutting.
Buying guidance
Save a service record for the installed door
A custom order record should include the requested width and height, the dimensional basis for those numbers, every calculated rough-opening and frame dimension, the selected model, wall depth, finish, flap count and the installer’s approval. Save the oversized pricing explanation when applicable. Custom service parts may depend on this exact history. Without it, a future flap or cover request can become a new measuring exercise in which a worn component is mistaken for the original production dimension.
Before submitting a made-to-order request, make sure the saved measurements tell one clear story: which pet was measured, what each dimension represents, where the door will be installed, and which options were selected. If the project requires a contractor or glass professional, keep that person’s verified construction dimensions beside the pet measurements so neither set is mistaken for the other. A complete record makes the order easier to confirm now and makes future flap, cover, lock or weather-strip service much easier.
Order-ready checklist
Five checks before a made-to-order purchase
Keep the measurement sheet, exact product page and installation manual together through ordering and installation.
- Label every dimension by its basis
- Compare all standard sizes first
- Recheck decimals and wall depth
- Have the installer verify the frame footprint
- Save the approved custom configuration
Decision summary
Compare the project from four angles
Primary decision
Use a custom opening only after comparing all 11 standard sizes and deciding whether the required dimension is flap opening, rough opening or frame tip-to-tip.
Fit check
Start from the pet’s required clear passage and a comfortable step-over. The custom calculator translates between dimensional bases using the manufacturer relationships.
Installation check
Confirm the custom frame footprint and rough opening with the installer before production. Include wall depth, surface type, frame orientation and load direction where applicable.
Ownership check
Custom dimensions still use the selected model, finish and flap package. Oversized pricing above the published table is an area-based estimate and should be treated as such on the order.
Continue comparing
Related dog-door collections and guides
Common questions about custom-size dog doors
What should I compare first when shopping custom-size dog doors?+
Use a custom opening only after comparing all 11 standard sizes and deciding whether the required dimension is flap opening, rough opening or frame tip-to-tip. Custom-Size Dog Doors are appropriate when the animal or an existing opening cannot be served responsibly by the 11 standard flap sizes. Custom should not be the first shortcut around careful measuring. Identify what the submitted width and height represent—clear flap, rough opening or frame tip-to-tip—and keep that basis attached to every note, calculation and installer discussion. A number without its dimensional basis is not an order-ready measurement.
How do I know whether custom-size dog doors will fit?+
Start from the pet’s required clear passage and a comfortable step-over. The custom calculator translates between dimensional bases using the manufacturer relationships. Check the clear flap opening for the pet, the rough opening for the cut and the tip-to-tip frame for the available mounting area.
What should an installer verify for custom-size dog doors?+
Confirm the custom frame footprint and rough opening with the installer before production. Include wall depth, surface type, frame orientation and load direction where applicable. The exact product instructions and selected SKU should be available before any permanent opening is made.
How should I maintain custom-size dog doors?+
Custom dimensions still use the selected model, finish and flap package. Oversized pricing above the published table is an area-based estimate and should be treated as such on the order. Record the model and size, keep moving surfaces clean and replace only verified compatible service parts.
How do I choose the right pet door size?+
Measure from the floor to the top of your pet’s shoulders and measure the widest point of the body. The flap should generally sit about 1–2 inches above the shoulders, with a comfortable step-over height. Use the actual pet measurements rather than breed averages.
Are these pet doors made to order?+
Yes. Frame color, flap count, size and installation type are selected for your opening. Review the measurements and selected configuration carefully before submitting an order.
Can I replace the flaps later?+
Yes. Replacement flaps, flap kits, magnets, weather stripping, locks and covers are available. Match the replacement part to the original pet-door size and model.