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Cat Doors

A well-sized cat door uses a compact opening and a manageable step-over so the cat can pass through naturally.

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Buyer's guide

Choosing cat doors

Start with the pet, the opening and the conditions around it. Then compare the details that make the installation comfortable, durable and easy to service.

Door Model
Start here

The right cat doors starts with the project

Measure the cat’s body width and shoulder height instead of relying only on weight.

  • For senior or mobility-limited cats, pay particular attention to the mounting height and flap resistance.
  • Door, wall, screen and professional in-glass options make it possible to place access where it works best for the home.
In-Glass Model *Professional Installation Required*
Fit and clearance

Fit the pet, then fit the frame

Measure shoulder height and body width with the cat standing naturally.

  • Senior cats, short-legged cats and cats with limited mobility may need a lower installation even when the flap itself is correctly sized.
  • Take each measurement at least twice.
  • Use the widest body point for horizontal clearance and the top of the shoulders for vertical planning; the head may dip naturally, but the back should not scrape the frame.
Door Model
Installation planning

Plan the installation before ordering

Choose a calm, accessible route and verify the frame has enough flat mounting area.

  • Screen and glass installations require their purpose-built systems rather than a generic door frame.
  • Once a flap size looks comfortable, stop and check the building dimensions.
  • Larger openings need larger rough cuts and frames, and tall sizes may run into glass, door rails, wall framing or screen crossbars.
Door Model
Ownership and service

Weather, service and long-term use

A single flap may be easier for a hesitant cat to learn, while an exterior location may justify a double-flap configuration once the cat can push both panels comfortably.

  • Sizing affects daily performance for the life of the opening.
  • An undersized door can encourage crouching, hesitation or contact with the frame.
Door Model
Common pitfalls

Mistakes to avoid

Do not size only from weight, and do not mount the bottom of the opening so high that the cat must jump through it on every trip.

  • 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.
Door Model
Order readiness

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.
  • 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.
Designed around real homes

What a good dog-door decision includes

Measure shoulder height and body width
Set a comfortable step-over
Compare actual flap dimensions
Check the larger frame footprint
Size for every pet using the opening
Installed pet door in a glass patio door
Decision summary

Compare the project from four angles

Primary decision

Prioritize low step-over and manageable flap resistance while keeping the opening only as large as the individual cat needs. Placement and quiet operation often matter as much as nominal size.

Fit check

Measure shoulder height and body width with the cat standing naturally. Senior cats, short-legged cats and cats with limited mobility may need a lower installation even when the flap itself is correctly sized.

Installation check

Choose a calm, accessible route and verify the frame has enough flat mounting area. Screen and glass installations require their purpose-built systems rather than a generic door frame.

Ownership check

A single flap may be easier for a hesitant cat to learn, while an exterior location may justify a double-flap configuration once the cat can push both panels comfortably.

Ready when the details agree

Find the door that fits the pet and the project.

Use the sizing quiz for a guided recommendation, or return to the products above with your measurements in hand.

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Related dog-door collections and guides

Compare compact pet doorsTrain a cat or dogUse the sizing guideInteractive sizing guideCustom size calculator
Questions, answered

Common questions about cat doors

What should I compare first when shopping cat doors?+

Prioritize low step-over and manageable flap resistance while keeping the opening only as large as the individual cat needs. Placement and quiet operation often matter as much as nominal size. Shopping Cat Doors begins with proportions, not a weight bracket. Dogs of similar weight can have very different shoulder height, chest width and leg length. The 11-size system includes tall versions that add vertical clearance without automatically adding width, plus wider XL and Giant choices for broad animals. Compare actual clear openings and watch the animal’s natural gait. The goal is a passage that does not demand a deep crouch, shoulder compression or a jump over an unnecessarily high lower edge.

How do I know whether cat doors will fit?+

Measure shoulder height and body width with the cat standing naturally. Senior cats, short-legged cats and cats with limited mobility may need a lower installation even when the flap itself is correctly sized. 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 cat doors?+

Choose a calm, accessible route and verify the frame has enough flat mounting area. Screen and glass installations require their purpose-built systems rather than a generic door frame. The exact product instructions and selected SKU should be available before any permanent opening is made.

How should I maintain cat doors?+

A single flap may be easier for a hesitant cat to learn, while an exterior location may justify a double-flap configuration once the cat can push both panels comfortably. Record the model and size, keep moving surfaces clean and replace only verified compatible service parts.

Can I use the sizing quiz before ordering cat doors?+

Yes. The sizing quiz is a useful starting point because it asks for the pet, opening type, size and weather conditions before pointing you toward a model family.

What if a standard size does not work for cat doors?+

Use the custom-size workflow after checking the standard size chart. Enter whether the measurement is based on flap opening, rough opening or outer frame so the order and installer are working from the same dimensions.

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.