The part owners worry about, and the part that matters
Owners booking a pet's flight almost always ask about the hold. Will it be pressurised, will it be heated, will the animal be frightened. Those are reasonable questions, and the answer is that the hold used for live animals is pressurised and temperature-controlled to roughly the same conditions as the cabin.
The risks that actually cause harm sit elsewhere: a crate an inch too small, a health certificate issued three days too early, a routing with a long summer layover, or an import permit that was never applied for. None of those happen in the air. All of them are settled on the ground, weeks before departure.
How IATA crate sizing is calculated
The IATA Live Animals Regulations set the container standard every airline applies, and the sizing rule is specific rather than approximate. An animal must be able to stand fully upright without its ears or head touching the top, turn around comfortably, and lie down in a natural position.
The measurements are taken from the animal, not chosen from a product range. Measure while the animal is standing naturally, then apply the formula. A crate that is close but undersized is refused at acceptance, and a refusal on the day of travel leaves an owner with a booked flight, a stressed animal, and no compliant container.
- Length = animal length from nose to base of tail (A) + half the leg height (B)
- Width = animal width across the shoulders, doubled
- Height = height from the floor to the top of the head or ear tips when standing
- Ventilation on all four sides for international carriage, not only the door
- A solid, leak-proof floor with absorbent bedding, never a wire base
- Metal hardware and door fastenings; plastic clip doors are commonly rejected
Crate familiarisation is the real welfare work
An animal introduced to its crate the night before travel experiences a strange box, an airport, and a flight all at once. An animal that has slept in the same crate for three weeks experiences a familiar space in an unfamiliar place, which is a substantially smaller event.
Two to four weeks is a realistic acclimatisation period. Feed the animal in the crate, leave the door open at home, and build up to longer settled periods inside it. This does more for welfare on travel day than any service level purchased from an airline.
Documentation, in the order it has to happen
Pet documentation is sequential, and the sequence is where most delays originate. Each step depends on the one before it, and several have validity windows that expire.
- Microchip first — an ISO 11784/11785 chip must be implanted before the rabies vaccination, or many destinations will not accept the vaccination record
- Rabies vaccination after the microchip, with the certificate showing the chip number
- Rabies titre blood test where the destination requires it, often with a mandatory waiting period of three months or more after sampling
- Import permit from the destination authority, applied for well ahead and sometimes taking weeks
- Veterinary health certificate issued close to travel, typically valid only 7 to 10 days
- Export clearance from the Pakistani animal quarantine authority
Why the timeline runs backwards from the titre test
Rabies-free and rabies-controlled destinations commonly require a blood titre test demonstrating an adequate antibody level, followed by a waiting period before the animal may enter. Where that period is three months, the entire relocation timeline is fixed by it.
An owner planning to move in six weeks to a destination requiring a three-month wait has only two options: delay the animal's travel, or accept quarantine on arrival. Neither is pleasant to discover late, which is why the destination requirements should be checked before any other arrangement is made.
Routing decides more than the airline does
A direct flight is almost always better for an animal than a cheaper itinerary with a connection, and the reason is ground time rather than flight time. At a transhipment point the animal waits in a holding facility whose standard you cannot verify, and in summer that wait may be in ambient heat.
Airlines also apply seasonal embargoes on live animals when temperatures at origin, transit, or destination exceed defined limits, and brachycephalic breeds — pugs, bulldogs, Persian cats — face additional restrictions or outright refusal because of their breathing difficulty under stress.
- Prefer direct routings even at a meaningfully higher fare
- Avoid midday departures in summer; early morning and late evening are cooler
- Check seasonal embargoes for all three points: origin, transit, destination
- Confirm the airline accepts the breed before booking anything else
- Allow the consignee at destination to collect promptly rather than next day
Feeding, sedation, and the day itself
Do not sedate. Veterinary and IATA guidance is consistent on this: sedatives affect an animal's ability to regulate temperature and maintain balance at altitude, and a sedated animal that becomes distressed cannot right itself. Airlines routinely refuse animals that appear sedated.
Feed a light meal roughly four to six hours before departure rather than immediately before, and provide water up to the point of handover. Attach a water container accessible from outside the crate so it can be refilled without opening the door, and fix a small bag of the animal's own food to the crate for a delayed journey.
What we do, and when to start
UCL Cargo books live animal consignments under IATA Live Animals Regulations, advises on crate sizing against the animal's actual measurements, prepares export documentation alongside the booking, and routes to minimise ground time rather than to minimise cost.
Begin the conversation three to four months before an intended move, or as soon as a destination is known. Almost every difficult pet relocation we see is difficult because of a timeline nobody could compress — a titre waiting period, a permit backlog — and almost every one of those was avoidable with earlier notice.