IATA-compliant crate: how to choose the right size
An undersized crate is the single most common reason for a check-in refusal — and the easiest to avoid, with the right measurements taken correctly from the start.
The IATA rule in one sentence
The IATA Live Animals Regulations (LAR) come down to one simple principle: the animal must be able to stand without touching the top of the crate, turn around completely, and lie down naturally with legs extended. This isn't a comfort suggestion — airlines measure the animal at check-in, and a too-tight crate gets refused on the spot, often with no compliant replacement available at the airport.
How to measure your dog or cat correctly
Three measurements are enough, taken with the animal standing in its natural posture:
- Length: nose to base of tail, plus half the height at the elbow — that margin is what allows turning around, not just lying flat.
- Width: twice the animal's width at its widest point (usually the shoulders).
- Height: nose to floor in a natural standing position (head level, not stretched upward), plus a few centimeters for upright ears.
Materials matter as much as dimensions
A hold-compliant crate is rigid on every side — soft or collapsible models, fine for the cabin, aren't accepted in the hold. Ventilation needs to be present on at least three sides, the door secured with a metal mechanism (not just a plastic latch), and any wheels removed or locked for hold travel.
A clearly visible "Live Animal" label, a water dish accessible without opening the crate for long flights, and absorbent bedding round out the requirements most often checked at the counter.
The mistakes that most often lead to a refusal
Using a cabin carrier — soft-sided, without the required dimensions or rigidity — for a hold flight is the most common mistake: the two categories aren't interchangeable, even for a small animal. Buying a crate right at the strict minimum measurement, with no margin at all, is the second: an animal that's still growing, or simply measured in a slightly different posture on flight day, can be enough to tip it into refusal territory.
Finally, a correctly sized crate bought the night before departure still leaves the animal discovering it at the same time as the stress of travel — sizing and behavioral preparation work together, not one without the other.