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Flying With a Pet: Cabin, Hold and When Not to Go

What airlines actually require, why brachycephalic breeds are increasingly refused, and how to weigh whether flying is fair on the animal at all.

By Marcus ColeVeterinary review: Dr Elena Marsh8 min readPublished 2026-02-10Updated 2026-08-01

Cabin, hold and the size cut-off

Most airlines allow only very small dogs and cats in the cabin, in a soft carrier that fits fully under the seat in front. Anything larger travels as manifest cargo in a pressurised, temperature-controlled hold — a separate booking with its own paperwork, crate specification and fees.

Rules vary sharply between airlines and change without much notice, so confirm the current policy directly with the carrier a few weeks before travel, not from a forum post.

Why some breeds are refused outright

Many airlines will no longer carry brachycephalic (flat-faced) breeds such as bulldogs, pugs and Persian cats in the hold, because their narrowed airways make them disproportionately likely to suffer respiratory distress or die in transit. This is not overcaution — the published incident data behind these bans is real.

Preparing the animal, not just the paperwork

Get the animal used to its travel crate for weeks beforehand, feeding meals inside it so the space becomes a place of comfort rather than confinement associated with the journey itself. Avoid sedatives unless a vet has specifically prescribed and tested them for air travel; sedation can suppress the ability to regulate body temperature and balance at altitude.

Book direct flights where possible, travel on the same flight as your pet, and arrange minimal ground time between check-in and departure.

When the honest answer is don't

For elderly, brachycephalic, severely anxious or medically unstable animals, the kindest plan is often not to fly them at all. A trusted pet sitter or boarding arrangement at home, however inconvenient for your itinerary, can be the better welfare choice than a stressful, higher-risk journey.

Frequently asked questions

Is cargo hold travel dangerous for pets?
It carries real risk, concentrated in brachycephalic breeds, extreme temperatures and poor crate ventilation. For a fit, non-flat-faced adult animal in a compliant crate on a well-run airline, the risk is low but not zero.
Do pets need a health certificate to fly?
For most routes, yes — a vet-issued certificate within a set number of days of travel, plus vaccination and microchip records for international trips. Requirements are set by the destination country, not the airline.