IATA-Compliant Kennel Sizing

The Wrong Crate Gets Your Pet Turned Away at Check-In

Incorrect crate sizing is one of the most common reasons pets are refused airline boarding. Airlines require IATA-compliant kennels -- and compliance is not just about buying any hard-sided crate. It means the right dimensions for your specific pet, the correct ventilation configuration, approved locking mechanisms, and proper labeling.

Getting it wrong is expensive. Last-minute crate replacements at airports are often impossible to source, and if your pet cannot board, you may miss a connection, delay an international documentation window, or incur rebooking fees.

The Pet Porters helps families get crate sizing right before travel day -- with measurement guidance, our downloadable sizing calculator, and professional verification against your specific airline's requirements.

Request Crate Fitting Help Download Size Calculator (PDF)
What IATA Crate Compliance Requires
  • Pet can stand fully upright without touching the top
  • Pet can turn around completely inside
  • Pet can lie down in natural position
  • Ventilation on at least three sides
  • Secure, airline-approved locking mechanism
  • Water dishes accessible from outside without opening
  • Absorbent bedding or pad inside
  • Live Animal and Orientation labels affixed

Watch First

Pet Travel Kennel Sizing Video Guide

Watch this step-by-step guide before measuring your pet. It walks through the exact measurements required and shows how to apply the IATA sizing formula.

Download the Kennel Sizing Calculator (PDF)

Use this calculator to confirm the minimum crate dimensions required for your pet before purchasing.

Step-by-Step

How to Measure Your Pet for an Airline Travel Crate

You need four measurements. Take them with your pet standing naturally on a flat surface. Use a soft tape measure or a piece of string and a ruler.

A
Body Length

Measure from the tip of the nose to the base of the tail (not including the tail itself).

Measurement A
B
Leg Height

Measure from the floor to the elbow joint of the front leg (the bend in the leg).

Measurement B
C
Standing Height

Measure from the ground to the top of the head (or top of ears for upright-eared breeds).

Measurement C
D
Width at Shoulders

Measure across the widest point of the shoulders. This determines the minimum interior crate width.

Measurement D
The IATA Formula

Apply these calculations to determine minimum crate dimensions

A + ½B
Min. Length
C + 4"
Min. Height
D × 2
Min. Width
Pet wt.
Affects crate strength

Example: Pet is 28" long (A), elbow height 8" (B), standing height 22" (C), shoulder width 12" (D) → Min. crate: 32" L × 26" H × 24" W

Quick Reference

Airline Pet Crate Size Chart

These are general guidelines based on IATA kennel sizes. Always verify your pet's specific measurements using the formula above -- this chart is a starting point only.

IATA Size Interior Dimensions (approx.) Typical Pet Weight Common Breeds / Examples
100 21" L × 15" H × 14" W Up to 10 lbs Chihuahua, Yorkshire Terrier, small cats
200 27" L × 20" H × 18" W 10-25 lbs Beagle, Cocker Spaniel, most cats
300 32" L × 23" H × 22" W 25-50 lbs Border Collie, Bulldog, Springer Spaniel
400 36" L × 26" H × 25" W 50-70 lbs Labrador, Golden Retriever, Weimaraner
500 40" L × 30" H × 27" W 70-90 lbs German Shepherd, Rottweiler, Doberman
700 / XXL 48"+ L × 34"+ H × 30"+ W 90 lbs+ Great Dane, Mastiff, Saint Bernard -- freighter aircraft only
Important: Size 700 and XXL kennels are accepted on freighter aircraft only -- not on standard passenger flights. Alaska Airlines is one of the few carriers that accommodates these sizes. Always confirm kennel acceptance with your specific airline and aircraft type before purchasing.

Full Requirements

IATA Live Animal Kennel Requirements

Beyond size, airlines inspect crates at check-in for these specific requirements. All must be met before your pet boards.

Construction
  • Rigid hard-sided material (no soft-sided for cargo)
  • Solid floor, leak-proof or with absorbent pad
  • Secure bolt-on or clip-lock assembly (no tape)
  • Handles or grip points on sides for handling
  • No sharp interior edges or projections
Ventilation
  • Openings on at least three sides (four preferred)
  • Ventilation spacers on exterior to prevent blocking by adjacent cargo
  • Openings covered with mesh or bars -- pet cannot escape
  • No obstructions to airflow when crate is placed in cargo position
Labeling
  • "Live Animal" label on top and at least one side
  • Orientation arrows ("This Way Up") on all four sides
  • Owner name, address, and contact information
  • Feeding and watering instructions attached outside
  • Food pouch with 24-hour supply attached for long flights

Professional Crate Fitting Assistance

The IATA formula gives you a minimum dimension -- but minimum is not always sufficient. Airlines also have their own additional requirements layered on top of IATA, and these vary by carrier. A crate that passes IATA standards may still be rejected by a specific airline if it does not meet their supplemental requirements.

The Pet Porters verifies your pet's crate against the specific requirements of your airline -- not just the IATA baseline. We also check that the crate size is accepted on the aircraft type operating your route, since size 700 kennels are not accepted on most passenger aircraft even if the airline's general policy permits them.

Crate fitting guidance is also available as part of our Pet Transportation Consultation if you need a full travel plan alongside crate sizing.

Common Crate Mistakes That Cause Check-In Rejection
  • Crate too small -- pet cannot fully stand
  • Soft-sided carrier submitted for cargo travel
  • No ventilation spacers on exterior
  • Zip-tied or taped shut instead of bolt-locked
  • Missing Live Animal labels or orientation arrows
  • No food/water access from outside
  • Size 700 crate booked on passenger aircraft

Not Sure If Your Crate Will Be Accepted?

Tell us your pet's measurements, breed, and airline. We will verify whether your current crate meets the requirements -- or advise exactly what to purchase before travel day. No surprises at the airport.