The IATA crate sizing guide, done properly
The short answer
An IATA-compliant crate must let your pet stand fully upright without their ears touching the roof, turn around completely, and lie down naturally. Measure length from nose to tail base (A), floor to elbow (B), width at the widest point (C), and floor to top of head or ears while standing (D). Crate length = A + ½B, crate width = 2 × C, crate height ≥ D.
The most common reason a pet is refused at an airline counter is not paperwork. It is a crate that is one size too small. It is entirely preventable with four measurements and a tape.
The four measurements
Take all of them with your pet standing naturally on all four legs, not sitting, not stretched, not mid-shake.
| Letter | What to measure | How |
|---|---|---|
| A | Length | Tip of the nose to the base of the tail (not the tail tip) |
| B | Elbow height | Floor to the elbow joint of the front leg |
| C | Width | The widest point across the body, usually the shoulders |
| D | Standing height | Floor to the top of the head, or ear tips if the ears stand up |
The formulas
- Crate internal length = A + ½B
- Crate internal width = C × 2
- Crate internal height = D, at minimum. With clearance above the ears
What makes a crate airline-legal
IATA's Live Animals Regulations set out Container Requirement 82 for dogs and cats. A compliant crate has all of the following, and most crates sold on Indian e-commerce sites have at least one of them wrong.
- Rigid plastic, fibreglass or wood construction: no collapsible fabric, no wire crates
- Ventilation on all four sides, with the required open area on the door side
- A metal-grille door with a spring-loaded, centrally-locking latch
- The two halves joined by metal nuts and bolts, not plastic clips
- No wheels, or wheels that have been removed or immobilised
- An absorbent, leak-proof floor with no interior projections that could injure
- Food and water bowls fixed inside the door, refillable from outside
Getting your pet to actually like the crate
A crate that arrives on travel morning is a trap. A crate that arrived ten days ago is furniture. Give yourself a week and follow this sequence.
- Day 1–2: assemble it, remove the door entirely, put it where the family sits. Do nothing else.
- Day 3–4: feed every meal just inside the doorway. Leave treats inside at random times.
- Day 5–6: put familiar bedding in and feed at the back. Let naps happen. Still no door.
- Day 7–8: refit the door, leave it open. Close it for 30 seconds during a meal, then open it.
- Day 9–10: build to 10–15 minutes closed while you're in the room, then while you step out.
Travel-day fit-out
- Absorbent bedding or a puppy pad, plus one item that smells like you
- Water bowl frozen the night before, so it melts into a drink instead of spilling
- “LIVE ANIMAL” stickers on the sides and orientation arrows pointing up
- A laminated card with your pet's name, your name, and two contact numbers
- Feeding and medication instructions taped to the top, in English
- Cable ties on all four corners of the door: secure, but cuttable in an emergency