Fit to Fly Certificates for Dogs and Cats: A Complete Guide to Pet Air Travel
Last updated: 13 September 2026
When pet owners come to us about international travel, they’re often prepared for an AHC or an EHC but haven’t heard of a Fit to Fly certificate until their airline mentions one. It’s worth understanding the distinction early, because it shapes everything else in this guide.
Destination documentation, whether an AHC, an EHC or country-specific paperwork, answers one question: does this pet meet the destination country’s entry requirements? A Fit to Fly assessment answers a different question entirely: is this individual pet clinically suitable for the journey being proposed? One is about the border. The other is about the animal. Many international journeys need both, and one does not necessarily replace the other.
This guide covers what a Fit to Fly assessment involves, when carriers ask for one, what the vet is actually assessing, and how it sits alongside the destination paperwork covered in our AHC and EHC guides.
Fit to Fly: the essentials
What it answers: whether an individual pet is clinically suitable for a specific proposed journey, not whether they meet a destination country’s entry rules.
Who requires it: set by the airline or transport operator, not by a single international standard. Requirements vary by carrier, route, species and sometimes breed.
How long it lasts: determined by the specific carrier or operator. A 7 to 10 day window before travel is common, but it isn’t universal, and some operators use considerably longer or shorter periods.
Who issues it: a veterinary surgeon, though the required wording and format differ between carriers.
What it doesn’t guarantee: that the airline will accept the pet. The carrier’s own breed, crate, temperature and route restrictions still apply independently of the veterinary certificate.
What is a Fit to Fly certificate?
A Fit to Fly certificate (sometimes called a Fit to Travel certificate or a fitness to fly statement, and occasionally folded into a wider health certificate) is a veterinary document confirming that, in the vet’s clinical judgement, an individual animal is fit for the journey they’re about to undertake.
Carrying a live animal is a welfare responsibility airlines and transport operators take on directly, and many want independent veterinary confirmation that the pet is unlikely to become distressed, unwell or unsafe during that specific flight, connection and crate arrangement before they accept it.
A Fit to Fly assessment isn’t intended as a full diagnostic work-up. It is, however, a meaningful clinical assessment of whether the individual pet is suitable for the proposed journey, taking into account their current health and the risks specific to that journey: route, duration, method of transport, expected temperatures and so on. The exact scope, wording and terminology can differ between carriers, which is one of the reasons this document doesn’t come in a single standard format.
What it isn’t is a passport document. It doesn’t establish rabies status, satisfy import conditions, or substitute for an AHC, EHC or any other destination paperwork. A pet flying to the EU, for example, might need both an AHC for entry and a Fit to Fly certificate for the airline, sometimes prepared at the same appointment, sometimes not.
Does my pet need a Fit to Fly certificate?
Not every pet flying internationally needs one. Whether yours does depends on a combination of factors:
the airline or transport operator
whether you’re booked on a conventional commercial flight, a shared charter, or a pet-focused private service
your route and destination
the species travelling
how your pet is travelling (cabin, hold, or manifest cargo)
sometimes breed, particularly for brachycephalic dogs and cats
occasionally individual circumstances such as age or a known health condition
Because these requirements sit with the carrier rather than a single regulatory body, the reliable way to find out is to check directly with your specific airline or operator before booking your appointment. This is worth doing early, since it also determines your timing, covered below.
Fit to Fly vs AHC vs EHC
A Fit to Fly assessment or certificate addresses whether an individual pet is clinically suitable for a proposed journey and is governed by the requirements of the airline or transport operator. An Animal Health Certificate (AHC) supports qualifying non-commercial travel from Great Britain into the EU and is based on EU entry rules. An Export Health Certificate (EHC) is used where the destination country has its own specific import requirements.
Not every journey needs all three. A straightforward EU trip might only need an AHC. A journey further afield might need an EHC and, depending on the airline, a Fit to Fly certificate as well. If you’re unsure which applies to you, tell us your itinerary and we’ll confirm what’s actually required.
What happens during a Fit to Fly assessment?
The examination focuses on your pet’s suitability for the proposed journey. Depending on the individual pet and what the carrier asks for, the vet may consider:
general health and body condition
demeanour, temperament and likely stress response
respiratory and cardiovascular function
mobility
age and life stage
underlying medical conditions, recent illness or recent surgery
pregnancy, where relevant
breed-specific risk factors, particularly for brachycephalic pets
expected temperatures and the length and complexity of the journey, including connections
Not every assessment covers every item. A young, healthy, non-brachycephalic dog on a short direct flight is a different picture from an older cat with a heart murmur flying via two connections in summer, and the assessment reflects that difference. The underlying question stays the same throughout: is this pet, on this journey, likely to travel safely and without significant distress.
How long is a Fit to Fly certificate valid?
There is no universal validity period. It’s set by the individual carrier or operator, and it can vary by route and destination too.
A number of commercial carriers use a window of around 7 to 10 days before travel. Qatar Airways, for example, currently states that a pet’s health certificate must confirm they’re fit to fly within 10 days of travel, and Emirates applies a similar 10-day window. This is likely where the idea of a “standard” rule comes from, but it isn’t one. K9 JETS, a private pet-focused charter operator, currently allows its Fit to Fly documentation to be completed within 30 days of arrival at certain destinations, considerably longer than the commercial norm.
In practice, this means finding out the window first and timing the appointment to sit within it: close enough to departure to remain valid, but early enough to leave room to act on anything the assessment identifies.
These are illustrative examples, not an exhaustive list, and individual policies can change without notice.
Brachycephalic pets and air travel
Brachycephalic (snub-nosed or flat-faced) breeds have a shortened skull and muzzle. Common examples include French Bulldogs, English Bulldogs, Pugs, Boston Terriers, Pekingese, Shih Tzus and Persian cats.
Their anatomy already predisposes many of these animals to some degree of breathing difficulty in ordinary circumstances, and panting, a dog’s main cooling mechanism, is less effective in brachycephalic breeds. The heat, confinement and stress that can accompany air travel add to that existing predisposition.
Being brachycephalic does not automatically mean a pet is unfit to fly. Some snub-nosed dogs and cats can travel successfully in the cabin where the carrier permits it and the individual pet is considered suitable, but cabin travel does not remove all of the risks. It does mean that carriers apply more specific restrictions to these breeds than to others, and those restrictions take different forms:
Some airlines, including American Airlines, publish a specific list of brachycephalic breeds they will not accept as checked baggage or in the cargo hold, covering both dogs and cats.
IAG Cargo, which handles cargo for British Airways among others, requires snub-nosed dogs and cats to travel in a container at least 10% larger than the standard minimum, and notes that some snub-nosed breeds may not be accepted depending on route.
Qatar Airways manages the risk through temperature-related restrictions rather than a fixed breed ban.
Airlines that exclude brachycephalic breeds from the hold sometimes still accept small snub-nosed dogs and cats in the cabin, subject to the usual weight and carrier rules.
A pre-travel veterinary assessment is worth having for any brachycephalic pet regardless of what the airline strictly requires, since it gives you an honest, individual view of their respiratory and cardiovascular health before you commit to a booking.
Private aviation and shared charters
A small but growing number of operators now offer pet-focused private or shared charter flights, where dogs (and sometimes cats) travel in the cabin alongside their owners rather than in the hold.
Cabin-based travel of this kind can avoid some of the risks and restrictions associated with hold or cargo transport, including the breed exclusions discussed above. It does not automatically remove the need to meet veterinary or destination-country requirements.
Requirements differ between these operators, and between them and conventional airlines, so it’s worth asking the operator directly rather than assuming private or shared charter travel is a shortcut around veterinary paperwork.
When might a pet not be considered fit to fly?
Fitness to fly is an individual veterinary decision, based on the animal’s health and the specific journey proposed, rather than a fixed checklist. Circumstances where air travel may need to be postponed or reconsidered include:
significant or poorly controlled respiratory or cardiac disease
acute illness, or recent major surgery with incomplete recovery
severe mobility problems
pregnancy in certain circumstances, particularly later stages
significant anxiety or stress responses that could put the pet at risk during travel
any other condition that would make it difficult for the pet to safely tolerate the specific journey proposed
A pet with a stable, well-controlled condition isn’t automatically excluded. A dog on stable medication may well be fit for a short direct flight, even where a longer, multi-leg journey in warmer conditions would need a different conversation. That’s the reason this has to remain a case-by-case judgement rather than a general rule about a condition or a breed.
What happens if concerns are identified?
If an assessment raises concerns about a pet’s suitability for the proposed journey, a few things typically follow. The journey may need to be postponed. Further investigation or treatment may be needed through the pet’s regular veterinary practice. In some cases, an alternative method of transport might be worth considering.
The London Travel Vet is a travel-focused veterinary service, and we work alongside your pet’s regular practice rather than in place of it. Where an assessment identifies a significant underlying issue, our role is to give you an honest, individual view of the travel-specific findings and point you to the right place for anything beyond that, whether that’s your usual vet or a referral service, so the condition gets the ongoing attention it needs from the practice best placed to provide it.
Does a Fit to Fly certificate guarantee that my pet can travel?
No. A Fit to Fly certificate represents the veterinarian’s clinical assessment at the time of examination. It confirms that, in the vet’s judgement, the pet was fit for the proposed journey at that point. It does not guarantee that the airline will accept the pet.
Carriers apply their own operational requirements independently of the veterinary certificate, which can include:
breed restrictions
temperature restrictions or seasonal embargoes
crate and container requirements
aircraft-specific restrictions
route restrictions
other operational requirements set by the carrier
A pet can hold a valid Fit to Fly certificate and still be refused travel if, for example, ground temperatures exceed the carrier’s threshold on the day, or the crate doesn’t meet the specification for that route. The certificate and the airline’s own acceptance criteria are separate hurdles, and both need to be satisfied.
When should I book a Fit to Fly assessment?
Before booking your veterinary appointment, establish, in order:
your destination country’s entry requirements (AHC, EHC, or other documentation)
your airline or operator’s specific requirements, including whether a Fit to Fly certificate is needed at all
the wording or format they expect
the timeframe before travel within which it must be issued
Only once you know all four should you book the assessment itself, timed to fall within your carrier’s window. Leaving this until the last minute creates avoidable risk: if the assessment identifies something worth a second look, or the paperwork needs correcting, you’ll want time in hand rather than a departure date bearing down on you.
Common Fit to Fly mistakes
Assuming it’s the same as the destination paperwork.
It answers a different question and doesn’t replace an AHC or EHC.
Working to a generic “10-day rule.”
It’s common, not universal. Confirm your specific carrier’s window.
Booking the vet appointment before checking the airline’s requirements.
Establish what’s needed first, then work backwards from your departure date.
Assuming a brachycephalic pet is automatically excluded, or automatically fine.
Check the specific carrier’s policy for your pet’s breed and route.
Assuming a valid certificate guarantees boarding.
The airline’s own breed, crate, temperature and route rules apply independently.
Assuming private or shared charter travel means no paperwork.
Private and shared charter operators have their own veterinary and documentation requirements.
How The London Travel Vet can help
We provide veterinary Fit to Fly assessments for dogs and cats travelling internationally from London. At the appointment, we assess your pet’s individual suitability for the journey you’ve described, examine them clinically, and help you understand how the certificate fits alongside your wider travel documentation.
Book a Fit to Fly assessment with The London Travel Vet →
Not sure whether your journey needs a Fit to Fly certificate, an AHC, an EHC, or a combination? Get in touch with your itinerary and we’ll confirm what applies.
We’re also exploring additional support for more complex international relocations involving pets with ongoing medical needs. This isn’t a service we currently offer, but if it’s something you’d find useful, we’d be interested to hear from you.
Frequently Asked Questions
What is a Fit to Fly certificate?
A veterinary document confirming a pet is clinically suitable for a specific proposed flight, usually required by the airline rather than the destination country.
Does my pet need a Fit to Fly certificate?
It depends on your airline or operator, route and sometimes breed. Confirm with your specific carrier.
Is a Fit to Fly certificate the same as an AHC?
No. An AHC supports qualifying non-commercial EU travel. A Fit to Fly certificate confirms fitness for the journey itself. Some trips need both.
Is a Fit to Fly certificate the same as an EHC?
No. An EHC certifies that a pet meets a destination country’s import requirements. A Fit to Fly certificate addresses a separate question about the pet’s fitness for the journey.
How long is a pet Fit to Fly certificate valid?
This is set by the individual carrier. A 7 to 10 day window is common, but some operators allow longer. Always check your carrier’s current requirement.
How close to the flight should my pet have a Fit to Fly assessment?
Within whatever window your carrier specifies, close enough to remain valid but early enough to address anything the assessment identifies.
Do airlines require Fit to Fly certificates?
Some do, but this varies by carrier, route and how the pet is travelling.
Do private jets require Fit to Fly certificates for pets?
Some pet-focused charter operators have their own veterinary documentation requirements. Private travel doesn’t remove this.
Can brachycephalic dogs fly?
Many can, particularly in the cabin, though airline policies vary considerably by breed and route. Being brachycephalic doesn’t automatically make a dog unfit to fly, but it warrants a proper individual assessment.
What happens if my pet is not considered fit to fly?
The journey may need to be postponed, and further investigation or treatment may be needed through your regular veterinary practice. The London Travel Vet can advise on the travel-specific findings but doesn’t manage ongoing treatment of an underlying condition.