Taking Your Dog or Cat on an International Flight: The Honest Guide the Pet Shop Won't Give You

The right question isn't "how to take my dog." The right question is "should my dog go?" Some breeds should never fly—French bulldog, pug, boxer, Persian, exotic, any brachycephalic. Their short respiratory systems collapse at altitude and in pressurized air, and most pet deaths on international flights are these breeds. American Airlines, United, and Delta have banned brachycephalics in cargo since 2019. Some airlines accept them in cabin with a liability waiver. A serious vet will still discourage you.

If your dog is a Yorkshire, a Shih Tzu (careful—Shih Tzu is also brachycephalic, but less so), a mini schnauzer, a toy poodle, a chihuahua, or if it's a cat—go ahead.

If it's a bulldog, pug, or Persian—think twice. Seriously. Consider leaving it with a professional caregiver for six months and making the move yourself first.

This guide assumes you've decided to go. Let's cover the three most requested routes: Brazil-United States, Brazil-Portugal (and European Union), Brazil-Japan.

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Brazil-United States: The Simplest Route

The USA accepts pets with comparative ease. It doesn't require a mandatory microchip by federal law (some states do—Hawaii is an exception, requiring quarantine), no serology required, no airport quarantine.

What you need:

Rabies vaccine valid, applied more than 30 days and less than 12 months ago. For puppies, more than 30 days and the animal must be at least 12 weeks old at boarding.

International health certificate, issued by a licensed veterinarian, no more than 10 days before the flight. Here's the detail no one tells you: the certificate must be issued on a specific form, in English, and endorsed by Vigiagro (from Mapa) at the departure airport. You need to go to the Vigiagro post in Guarulhos, Galeão, Confins, or Viracopos with the certificate, with the live animal present, and get the stamp. Without the stamp, the airline won't board the animal.

Realistic cost to prepare the documentation: R$ 350-500 with a veterinarian, plus R$ 0 with Vigiagro (free, but requires an appointment). Total time: 60 days before the flight is comfortable, 30 days is tight, less than that is risky.

Flight cost: in cabin, USD 150-200 per leg (American, United, Delta). In cargo, USD 800-1,300. The limit for cabin is animal + carrier weighing up to 8 kg on most American airlines. Delta accepts up to 9 kg in domestic cabin and 8 kg in international.

Airlines to look at first: United (PetSafe is their well-run cargo program), American Airlines (well-served cabin), Delta (more restrictive since 2023). Avoid LATAM on international routes to the USA—they accept, but logistics at Galeão is chaotic.

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Brazil-Portugal and European Union: ISO Microchip is Non-Negotiable

Europe closed a single regulation for pet entry in 2014. It applies to Portugal, Spain, Italy, France, Germany, all 27 EU countries. The process is stricter than the USA, but predictable.

ISO 11784/11785 microchip implanted first, before any vaccine. I repeat: first the microchip, then the vaccine. If you vaccinated before microchipping, the vaccine doesn't count for Europe, and you need to revaccinate. Twenty percent of EU boarding denials are due to this inversion.

Rabies vaccine applied after the microchip, with at least 21 days of waiting between the vaccine and boarding. The vaccine must be valid but cannot be the animal's first ever—it needs a booster.

Echinococcus treatment (specific worm): mandatory only if you're entering directly in Ireland, Finland, Malta, or Norway. For Portugal, Spain, Italy, France—it's not required.

CVI certificate (International Veterinary Certificate) issued by Mapa, up to 10 days before boarding. Official EU form, in Portuguese and English or in the language of the entry country. Needs Vigiagro endorsement, same as the USA.

Realistic documentation cost: R$ 800-1,200 (microchip + vaccine + certificate + Vigiagro). Minimum preparation time: 90 days if vaccines are up to date. 120 days with leeway.

Flight cost: the Brazil-Lisbon leg in cabin costs €280-350 (TAP), €300-380 (Lufthansa via Frankfurt), €320-400 (KLM via Amsterdam). In cargo, €700-1,200 depending on the weight of the carrier.

Airlines to look at first: Lufthansa is the world reference in animal transport. The Lufthansa Cargo "Animal Lounge" program in Frankfurt has a 24-hour veterinary clinic, air conditioning, feeding, and trained staff. KLM has a similar operation in Amsterdam. Air France in Paris CDG is also good. TAP accepts pets in cabin on the Brazil-Lisbon flight, it's the most direct option—but the operation is simpler, without an animal hub. For small animals in cabin, TAP works. For cargo, prefer Lufthansa via Frankfurt even if it requires a connection.

Important detail for Portugal: arrival in Lisbon requires passing through PIF (Border Inspection Post) at the airport. The Lisbon PIF operates 24 hours, but it can take 2-3 hours. Be patient. Do not leave the airport before getting the stamp.

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Brazil-Japan: Another Planet, Prepare for 7 Months

Japan has the world's strictest protocol for pet entry, along with Australia and New Zealand. The historical reason is the island being rabies-free—they defend this status as a matter of national public health.

The process is called "advance notification" and has mandatory steps:

ISO microchip implanted first.

Two rabies vaccines applied with a minimum interval of 30 days, both after the microchip.

Rabies antibody titer test (FAVN), done at a laboratory approved by the Japanese government. In Brazil, the only approved labs are IPEC/Fiocruz in Rio de Janeiro or Instituto Pasteur in São Paulo. Blood must be drawn between the second vaccine and 12 months later. The test must show a titer equal to or greater than 0.5 IU/ml.

Wait 180 days (six months) counted from the date of blood draw for the serological test until boarding. If you board before 180 days, the animal enters quarantine at the arrival airport for up to 180 days minus the elapsed time. Quarantine costs about ¥3,000 (R$ 100) per day in Narita.

Advance notification to MAFF (Japanese Ministry of Agriculture) at least 40 days before boarding, via the AQS form on the official website.

CVI certificate from Mapa up to 10 days before the flight.

Realistic documentation cost: R$ 2,500-4,000 (microchip + two vaccines + serological test + certificate + advance notification). Minimum preparation time: 210 days (7 months). If you have a trip planned for 3 months from now, forget Japan—it won't work.

Flight cost: ANA and JAL accept pets in cabin only on domestic flights in Japan. For the international leg Brazil-Tokyo, both only accept in cargo, costing USD 1,200-1,800. The alternative is to do Brazil-Europe on one airline (Lufthansa, KLM) and then Europe-Tokyo on another. But each connection multiplies risk. For Japan, prefer a direct flight if it exists, even if more expensive.

Airlines to look at first: Lufthansa via Frankfurt, with a minimum 4-hour connection in Frankfurt for the animal to rest in the Animal Lounge before continuing. KLM via Amsterdam with the same logic.

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Where to Seat the Cat and Dog: Cabin vs. Cargo

The cabin is always better for the animal—it's with you, at room temperature, with normal ventilation. But the cabin has a weight limit: animal + carrier of no more than 7-8 kg. Above that, it goes to cargo.

Modern international cargo is not the luggage hold. It's a separate compartment, pressurized, air-conditioned to 18-22°C, with light and oxygen. In serious airlines (Lufthansa, KLM, United PetSafe), cargo is monitored by a specialized team. In less serious airlines, it's treated as bulky luggage.

Real risk in cargo:

Heat: between May and September, flights leaving Brazil for Europe have tarmac temperatures of 35-40°C. The animal waits in an air-conditioned warehouse, but the journey from the warehouse to the hold can take 20 minutes in the sun. Most cargo deaths in summer are due to hyperthermia on this journey. Lufthansa does not board animal cargo if the forecast temperature at destination or origin exceeds 27°C.

Cold: the opposite problem in the European winter. Short-haired animals suffer if the temperature drops below 4°C at boarding.

Stress: the noise of the cargo compartment, even pressurized, is loud. Anxious animals may panic. Acclimate the animal to the carrier for at least 30 days before the flight, leaving the carrier open in the living room, with toys inside, feeding the animal there during the last two weeks.

The practical rule: if it fits in the cabin, it goes in the cabin, even in a less premium airline. If it doesn't fit in the cabin, choose the better airline for cargo (Lufthansa, KLM, United PetSafe), avoid European summer and Asian winter, and pay the extra for a direct flight.

The Transport Carrier: Sherpa Original or Petmate Aspen

Buying the wrong carrier is the second biggest mistake of first-time pet travelers (the first is starting documentation too late).

For cabin: the gold standard is the Sherpa Original Deluxe, in medium size (44 x 28 x 28 cm). Soft canvas, semi-rigid structure, ventilation on three sides, with "Airline Approved" tag covering almost all international airlines. Costs R$ 700-900 in Brazil, USD 60-80 in the USA. Weighs 1.2 kg empty. Fits an animal up to 7 kg. The "Airline Guaranteed On Board" version has a written certificate that serves as an argument if any check-in staff questions it.

Alternative: Petmate Soft-Sided Pet Carrier (R$ 450-600), good quality, a bit more rigid, same capacity.

Do not buy a generic marketplace carrier for R$ 150-250. It lacks IATA certification, doesn't have an approval tag, and any strict staff can refuse boarding at check-in.

For cargo: the rule changes completely. The carrier must be rigid, IATA standard, with:

• Metal screws (not plastic) joining the halves
• Metal door with double lock
• Ventilation on four sides
• Water and food bowl attached to the grids, reachable from outside
• "Live Animal" label and arrows indicating position
• Enough internal space for the animal to stand, turn, and lie stretched out

The reference model is the Petmate Sky Kennel (size adjusted to the animal's size), between R$ 600-1,500 depending on size. Buy the right size: if there's too much space, the animal wobbles and gets hurt; if there's too little, it's disqualified at check-in.

Carrier adaptation: 30 days before the flight, start. Leave the carrier open in the living room. Put a familiar toy inside. Feed the animal there during the last 14 days. Take three short car trips with the closed carrier in the last 7 days. An animal entering the carrier for the first time at the airport suffers unnecessarily.

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Real Costs Summed Up

Let's close the account of a Brazil-Lisbon trip with a 6 kg dog in cabin:

• ISO microchip: R$ 80
• Rabies vaccine booster: R$ 90
• Veterinary certificate and CVI: R$ 350
• Vigiagro (free, but travel cost): R$ 80
• Sherpa Original Deluxe carrier: R$ 800
• Flight surcharge (TAP, pet in cabin): €280 (R$ 1,700)
• Total: R$ 3,100

The same trip with an 18 kg dog in cargo:

• Documentation: same R$ 600
• Petmate Sky Kennel large size carrier: R$ 1,200
• Flight surcharge (Lufthansa cargo): €900 (R$ 5,400)
• Total: R$ 7,200

Brazil-Japan with a cat in cargo (worst case, due to documentation):

• Microchip + two vaccines + FAVN serological test: R$ 3,500
• Medium-sized rigid IATA carrier: R$ 900
• Flight surcharge (Lufthansa cargo via Frankfurt): USD 1,500 (R$ 8,250)
• Total: R$ 12,650, not counting trips to the lab in Rio or São Paulo for the blood draw.

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What NOT to Do, Under Any Circumstances: Sedate the Animal

In 2018, IATA (International Air Transport Association) and ACVB (American College of Veterinary Behaviorists) published an explicit rule: do not sedate the animal for flying.

The reason is physiological. Sedatives like acepromazine (the most commonly prescribed in Brazil) affect the animal's cardiorespiratory regulation. At altitude, with pressurized air and reduced oxygen, this interference can cause:

• Severe hypotension
• Bradycardia
• Hypothermia
• Vomiting with the sedated animal and risk of aspiration
• In extreme cases, cardiac arrest

Most documented pet deaths on international flights since 2010 involved sedation. Serious airlines (Lufthansa, KLM, United) may refuse boarding if the animal shows signs of sedation at check-in.

If your animal is very anxious, safe alternatives:

Acclimate to the carrier for 30 days before (the most effective thing).

Feliway (cat) or Adaptil (dog): synthetic pheromones in spray or diffuser, applied to the carrier 30 minutes before the flight. Moderate efficacy, but safe.

Calmex (oral supplement based on amino acids) or Zylkene (bovine casein): calming products that are not sedatives. Start 7-14 days before the flight.

Veterinary hypnotherapy or systematic desensitization with a behavioral veterinarian: work done over 60-90 days, effective in very anxious animals.

If the local vet offers you Acepran or similar for the flight, get a second opinion with a behavioral veterinarian. Traditional medication is now considered a technical error.

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How to Ensure the Small Dog Goes in Cabin, Not in the Hold

Cabin has a limit of pets per flight: most airlines accept only 2 to 6 animals in the entire plane. This means that if you don't book in advance, even if your dog is eligible, you might end up having to go in cargo or lose the ticket.

Reservation is mandatory:

1. Purchase the airline ticket normally.

2. Immediately afterward (the same day), call the airline's customer service and request the inclusion of the pet in cabin. Have on hand: animal's weight, carrier dimensions, breed.

3. Pay the surcharge on the spot (USD 150-280 depending on the route).

4. Receive confirmation by email with the pet reservation code (different from your PNR).

5. Reconfirm 72 hours before the flight. Airlines have a history of "losing" pet reservations in cabin. Without reconfirmation, you arrive at check-in and the system says there's no space.

On the day of the flight:

Arrive 3 hours early (4 hours for the USA, due to American immigration). Pet check-in is manual, it takes time. You'll need to show the original certificate, working microchip (they'll scan it), carrier in the right dimensions. Staff will weigh animal + carrier together.

At the security X-ray, remove the animal from the carrier, hold it in your arms, send the carrier through the conveyor belt. Reunite at the exit.

Onboard, the carrier stays under the seat in front, throughout the flight. The animal does not leave the carrier. You can unzip the top and put your hand inside, but the animal doesn't roam free. The flight attendant may ask to check if the carrier is closed during takeoff and landing.

Do not feed the animal in the 4 hours before the flight. Give water in small amounts up to 1 hour before. A fed animal vomits or relieves itself inside the carrier. Place an absorbent pad under the carrier lining.

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Real Case, and What We Learned from It

Mariana, 34, moved from São Paulo to Lisbon in January 2025 with her cat Pequi (4.5 kg). She started the documentation 45 days before the flight, thinking it was enough. It wasn't. Pequi's first rabies vaccine had been applied before the microchip—this was discovered at the international vet consultation. She had to revaccinate, wait 21 days, redo the certificate. She missed the original flight. Bought another one 30 days later.

Extra cost: R$ 2,800 (revaccination, new certificate, flight rescheduling fee).

Lesson: the microchip comes first, always, before any vaccine that will count for international documentation.

If you own a young pet and are considering any chance of international travel in the future, microchip the animal today, even without defined plans. It costs R$ 80 and is the only irreversible part of the process. Everything else (vaccines, certificates) can be done close to the date.

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Practical Summary by Route

Brazil-USA: 60 days of preparation, R$ 350-500 in documentation, USD 150-200 on the flight in cabin. Simplest.

Brazil-Portugal/EU: 120 days of preparation, R$ 800-1,200 in documentation, €280-400 on the flight in cabin. Medium.

Brazil-Japan: 210 days of preparation, R$ 2,500-4,000 in documentation, USD 1,200-1,800 on the flight in cargo (no cabin for this leg). Complex. Don't try to do it in less than 7 months.

On all routes: appropriate carrier (Sherpa Original in cabin, Petmate Sky Kennel in cargo), animal acclimated to the carrier for 30 days, pet reservation in cabin confirmed 72h before, solid fasting in the 4 hours prior, zero sedation.

And one thing no one tells you beforehand: the animal senses your fear. The calmer you are at the airport, the calmer it will be. If you arrive 4 hours early, with everything organized, with the dog accustomed to the carrier, with documentation in order—the journey is smooth. If you arrive 90 minutes early, anxious, with a new carrier the animal has never used, the flight becomes hell for both of you.

Start early. Do it right. It's worth it. Those who have done it never go back.