Menu
Take the sizing quiz
Dog Doors Depot
Sizing Quiz(866) 667-8126
Home / Collections / Small Dog Doors

Small Dog Doors

Small dogs need an opening that is easy to push, low enough to step through and not unnecessarily oversized.

Filter your search
By Category:
Popular For:
Sort By

Showing 25 products, sorted by featured.

Buyer's guide

Choosing small dog 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.

Power Pet Automatic Door-Mount Pet Door product detail
Start here

The right small dog doors starts with the project

Use shoulder height and body width as the primary measurements.

  • Puppies should be sized for expected adult dimensions, while senior dogs may benefit from a lower step-over.
  • Single-flap configurations offer less resistance.
  • Double flaps provide additional weather control where the pet is comfortable pushing both panels.
Power Pet Automatic Door-Mount Pet Door product detail
Fit and clearance

Fit the pet, then fit the frame

Measure the adult dog where possible.

  • For a puppy, use expected adult measurements cautiously and confirm that the selected frame will still fit the intended surface.
  • 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.
Power Pet Automatic Door-Mount Pet Door product detail
Installation planning

Plan the installation before ordering

Place the lower edge for an easy step rather than centering the frame on the door or wall.

  • Check the complete frame footprint before lowering the opening.
  • 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.
Power Pet Automatic Wall-Mount Pet Door product detail
Ownership and service

Weather, service and long-term use

Smaller or older dogs may prefer the lower resistance of a single flap, while confident pets in exposed locations may use a double-flap configuration for added weather control.

  • Sizing affects daily performance for the life of the opening.
  • An undersized door can encourage crouching, hesitation or contact with the frame.
Power Pet WiFi Automatic Wall-Mount Pet Door product detail
Common pitfalls

Mistakes to avoid

Do not oversize simply to be safe; a much larger opening can create a taller step, more air movement and a frame that no longer fits the available panel.

  • 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.
Power Pet Automatic Wall-Mount Pet Door product detail
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

Choose the smallest opening that allows relaxed passage, then keep the step-over low enough for the pet’s leg length, confidence and mobility.

Fit check

Measure the adult dog where possible. For a puppy, use expected adult measurements cautiously and confirm that the selected frame will still fit the intended surface.

Installation check

Place the lower edge for an easy step rather than centering the frame on the door or wall. Check the complete frame footprint before lowering the opening.

Ownership check

Smaller or older dogs may prefer the lower resistance of a single flap, while confident pets in exposed locations may use a double-flap configuration for added weather control.

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.

Take the sizing quizShop this collection
Continue comparing

Related dog-door collections and guides

Cat and compact pet doorsCompare medium sizesGentle training stepsInteractive sizing guideCustom size calculator
Questions, answered

Common questions about small dog doors

What should I compare first when shopping small dog doors?+

Choose the smallest opening that allows relaxed passage, then keep the step-over low enough for the pet’s leg length, confidence and mobility. Shopping Small Dog 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 small dog doors will fit?+

Measure the adult dog where possible. For a puppy, use expected adult measurements cautiously and confirm that the selected frame will still fit the intended surface. 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 small dog doors?+

Place the lower edge for an easy step rather than centering the frame on the door or wall. Check the complete frame footprint before lowering the opening. The exact product instructions and selected SKU should be available before any permanent opening is made.

How should I maintain small dog doors?+

Smaller or older dogs may prefer the lower resistance of a single flap, while confident pets in exposed locations may use a double-flap configuration for added weather control. Record the model and size, keep moving surfaces clean and replace only verified compatible service parts.

Can I use the sizing quiz before ordering small dog 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 small dog 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.