CDC Dog Import Rules: Rabies Forms and the Six-Month Age Minimum

Two summers have now passed since the most significant rewrite of America's dog import rules in decades took effect. The CDC's final rule on dog importation, effective August 1, 2024, replaced a rotating set of temporary suspensions and emergency measures with a permanent framework that applies to every dog entering the United States — family pets returning from vacation, puppies purchased abroad, rescue flights and service animals alike.

For most travelers the changes are straightforward, but the rule reshaped the logistics of bringing a dog into the country, and its effects are still working through airlines, border crossings and the rescue groups that move dogs internationally. As the 2026 travel season shows, compliance is now less a matter of paperwork luck than of sequencing and timing.

Why the CDC rewrote the rules

The public-health logic is centered on a single threat: dog-maintained rabies virus variant, or DMRVV, a rabies variant that circulates in dogs across much of the world. The United States was declared free of DMRVV in 2007, and the CDC's position is that importing even one infected dog risks reintroducing an almost universally fatal disease into a country where it had been eliminated.

CDC uses these requirements to reduce the risk of importing dog rabies. The relevant issue for an itinerary is the dog's travel history, not the owner's citizenship or whether the animal was originally born in the United States. A returning family pet can therefore fall under the higher-risk pathway.

Read the CDC entry pathway before buying tickets. Keep vaccination and microchip records together and check that the identifiers match. Documentation that appears sufficient for an airline or a foreign destination may still fail the separate requirements for return to the United States.

The baseline requirements

The rule's baseline obligations apply to every dog, regardless of origin. In summary, each animal must have: ^[1]

• an age of at least six months on arrival
• an ISO-compatible microchip, with the number listed on all documents
• a healthy appearance on visual inspection
• a CDC Dog Import Form receipt, completed online in advance
• rabies documentation when the dog has been in a high-risk country within six months

The six-month minimum is an entry requirement, not an invitation to calculate a younger exception from vaccine timing. Confirm the dog's age on the actual arrival date. A booking, adoption agreement or veterinary certificate does not waive the CDC age rule.

The CDC Dog Import Form is free. For dogs that have been only in dog-rabies-free or low-risk countries during the previous six months, CDC describes a receipt valid for multiple entries over six months, provided the departure country remains the same. Do not apply that convenience automatically to high-risk travel: use the separate instructions for that pathway.

These dog requirements should not be used as a complete cat import checklist. Cats have separate federal, state, territory and destination requirements. Travelers should consult the relevant official species guidance rather than assume that the absence of a dog-specific form means there is no paperwork.

High-risk country travel

Dogs that have been in a high-risk country during the six months before entry follow additional CDC requirements. The route differs for US-vaccinated and foreign-vaccinated dogs. Consult the official pathway for the required certification, government endorsement, microchip sequence, timing and port conditions before departure. A vaccine record alone is not interchangeable with the specified form.

Foreign-vaccinated dogs coming from high-risk countries need advance arrangements, including the required certification and a reservation at a CDC-registered animal care facility. A qualifying rabies titer affects whether quarantine is required, but does not eliminate all arrival procedures. Use the current CDC instructions for permitted airports, facility services and the quarantine pathway; do not plan a land entry for this category.

A document accepted during an earlier transition period may no longer be accepted for a new trip. Save the current pathway instructions with the booking, and ask the accredited veterinarian which endorsement is required. If paperwork is missing or circumstances change, contact CDC before travel rather than assume an airline can resolve the discrepancy at the counter.

How it is working in practice

Airlines can impose their own acceptance conditions in addition to government entry rules. Confirm the carrier's policy for the specific route and for every operating airline on a connecting itinerary. A government-compliant dog is not automatically eligible for cabin, checked or cargo transport on every flight.

Make a document comparison before departure: check the microchip number character by character, the dog's arrival age, the countries visited in the previous six months and the relevant vaccination dates. These are practical planning checks, not a measured ranking of the most frequent reasons for refusal. Keep both accessible digital copies and any originals required by the applicable pathway.

The CDC continues to update its frequently asked questions, and the framework it created appears built to last. For dogs, the rules have made international travel slower to arrange and more expensive to document. For public health officials, the trade is deliberate: a country that eliminated canine rabies is spending paperwork to keep it that way.