Air travel

Cargo pet travel has narrowed dramatically. Among major U.S. carriers, United and Delta now restrict hold/cargo pet transport to active U.S. military and State Department personnel, with narrow exceptions; American has restricted its program; Alaska and Hawaiian are the ones still offering general-public cargo. Practical translation: if your dog doesn't fit under a seat, flying may simply not be available on your route - plan ground transport or driving instead of discovering this two weeks out.

In cabin: Small dogs only - the carrier must fit under the seat and stay closed and stowed for the entire flight. There is no lap time on any major airline, not even briefly. Soft-sided carriers are typically required. Fees commonly run around $95-$150 each way, one pet per passenger, and cabins cap total pets - so book as early as possible.

Cargo hold: For dogs too large for the cabin, where still offered. Requires advance booking, an airline-approved hard-shell kennel, 'Live Animal' labeling with your contact and feeding instructions, and usually a health certificate.

Brachycephalic (flat-faced) breeds - French Bulldogs, Pugs, Boxers, Bulldogs, Boston Terriers - are restricted or barred from cargo across nearly every major airline, and for a real physiological reason: shortened airways make them disproportionately vulnerable to respiratory distress under the stress, reduced oxygen and temperature swings of a hold. These restrictions usually do NOT apply in-cabin, though a few carriers add a form or waiver. Separately, some carriers apply breed bans of their own - Delta bans pit bull-type dogs entirely, in cabin and cargo, regardless of size or temperament.

Heat embargoes. Airlines generally suspend cargo pet travel when ground temperatures exceed about 85F or drop below about 20F - and they're enforced on the day, not at booking. June through August is the highest-risk window, especially on hot routes or with long layovers. A small in-cabin pet is usually unaffected; a large dog can be grounded at the worst possible moment. Book early-morning flights in summer.

Domestic: Requirements vary by airline and many don't require a health certificate - but it's commonly recommended and some do. Hawaii is the notable exception, with its own quarantine and certification rules.

International: Almost always a USDA-endorsed health certificate plus destination-specific documents, rabies vaccination, and a microchip; some destinations require quarantine or arrival as manifest cargo.

Returning to the us: Dogs entering or re-entering the U.S. must meet current CDC import rules, including a microchip and the required entry form. Check these well in advance - they are not a gate-day fix.

Minimum age: Airlines generally require puppies to be at least 8 weeks old.

· Crate-train to the actual travel carrier weeks ahead - the carrier should be a familiar good place, not a first-time surprise
· Confirm the policy directly with the airline for YOUR route, aircraft and date; policies vary by aircraft and change often
· Microchip current, ID tags on, and a photo of you with your dog on your phone
· Exercise before the airport, then a light meal timed several hours out - not right before
· Freeze water in the bowl for cargo travel so it doesn't slosh out during loading
· Consider whether the trip is necessary at all: for many dogs, a trusted sitter at home is the kinder option (see care_while_youre_away)