How to Measure a Dog for an IATA-Style Travel Crate

Measure the dog, not the old crate

Crate labels such as medium, large, or airline approved are not enough. The correct size begins with the animal’s body measurements and the current container formula used for the trip.

Use a rigid tape measure or a straight measuring tool. Keep the dog standing naturally on a level floor. A second person can help maintain posture without stretching or compressing the dog.

The four core measurements

IATA’s public pet container guidance illustrates measurements commonly labeled A, B, C, and D.

A: body length

Measure from the tip of the nose to the base of the tail. Do not include the tail itself.

B: leg height

Measure the leg height used by the current IATA formula and illustration. Follow the diagram carefully because this value contributes to required container length.

C: shoulder width

Measure across the widest point of the shoulders. The minimum container width is calculated from this measurement.

D: standing height

Measure from the floor to the highest natural point of the head or erect ears. Use whichever is higher. The dog must be able to stand without the head or ears touching the roof.

Apply the current formula

IATA’s public guidance provides minimum internal container dimensions based on these measurements. It also identifies additional allowance for certain short-nosed animals.

Use the current IATA page and PDF when calculating. Do not rely on an old screenshot, seller chart, or a formula copied without a publication date.

The calculated dimensions are minimum internal dimensions. External product dimensions can be larger while providing less usable interior space because of wall thickness, wheels, lips, or tapered sides.

Fit is more than a number

Inside the assembled crate, the dog should be able to:

• Stand naturally without touching the roof.
• Sit without the head or ears being compressed.
• Turn around normally.
• Lie in a natural position.

The container must also meet construction, door, ventilation, fastener, food and water, and labeling requirements that apply to the booking.

Confirm with the operating airline

IATA publishes industry standards, but airlines decide whether to accept a container on a specific aircraft and route. Some carriers impose stricter requirements or limit the crate sizes that fit a particular aircraft hold.

Before purchase:

1. Give the airline the dog’s breed, age, weight, and measurements.
2. Give the airline the proposed crate’s internal and external dimensions.
3. Confirm the aircraft and route can accept that crate size.
4. Ask about short-nosed breed restrictions and seasonal embargoes.
5. Reconfirm close to departure as instructed by the carrier.

Avoid these crate mistakes

• Choosing by dog weight alone.
• Comparing product names instead of internal dimensions.
• Forgetting the height of erect ears.
• Buying before confirming the aircraft limit.
• Assuming a used crate still has every required fastener and fitting.
• Treating a retailer’s airline-approved label as carrier acceptance.