Before you plan a journey into the United States with your dog, check the entry requirements for the day your dog will arrive. The CDC rule that took effect on August 1, 2024 applies to dogs arriving from any country, including pets coming home after a holiday abroad. Age, identification and the import form each need attention. Put them on your planning sheet alongside the outward journey, so the return has its own clear set of preparations.
Why the rules changed
The HHS/CDC final rule in the Federal Register, published on May 13, 2024, revised the dog import regulation at 42 CFR 71.51. Its stated purpose is to prevent the reintroduction and spread of dog-maintained rabies virus variant, abbreviated DMRVV. The United States was declared free of that variant in 2007.
The rule's effective date is August 1, 2024. For your travel plan, the useful starting point is its scope: dogs arriving from all countries are covered. Start with the requirements below, then check the official guidance against your dog's particular journey before committing to travel.
The three requirements for every dog
Keep these as separate checks. Having one item ready does not answer the other two questions.
- ISO-compatible microchip before travel. The rule requires every arriving dog to have a microchip compatible with International Standards Organization standards before travel into the United States. If your dog already has a microchip, include its compatibility in your preparation discussion rather than assuming any chip meets this requirement.
- At least six months old on arrival. Check your dog's age against the planned U.S. arrival date. This minimum applies to a puppy coming back with you as well as a dog entering for the first time. An outward journey does not remove the age requirement for the return.
- CDC Dog Import Form and receipt. Submit the form online through the CDC-approved system before travel. The rule describes a form containing information about the importer and each dog. Present the receipt confirming submission when arriving at a U.S. port. If arriving by air, you must also show that receipt to the airline before boarding.
For practical preparation, write down what remains unresolved under each heading. That gives you a focused checklist: identification to confirm, age to compare with arrival, and a form receipt to have ready at the required stages.
Returning home counts too
A return journey is still an arrival into the United States under this rule. Your dog does not fall outside these requirements because the trip started there or because you describe the journey as coming home. The form requirement covers arrival by air, land or sea, including dogs from countries free of DMRVV or considered low risk for it.
Plan the return while arranging the outward trip. Keep a separate line for the U.S. arrival date and the receipt check before boarding if you are flying. That makes it easier to see which preparation belongs to which part of your itinerary.
Planning around the six-month minimum
The rule explains its concern about puppies too young to be properly vaccinated against rabies. It states that dogs cannot be vaccinated effectively before 12 weeks of age and are not considered fully vaccinated until 28 days after vaccination. These are the rule's stated vaccination milestones; they do not replace its separate requirement that every arriving dog be at least six months old.
If your proposed return would be before that age, reconsider the plan before taking your puppy abroad. Record both your departure and return dates when comparing options, and keep the age requirement separate from any discussion of vaccination records.
If your dog stays home instead
If the entry timing does not fit your trip, keeping your dog at home with a sitter is an option to consider. You can compare the preparations for travel with the arrangements needed for care during your absence, without assuming your dog has to accompany you.
Our house sitting guide explains the care arrangement and what to put in an agreement. For the broader journey, the international pet travel guide provides a framework for organising the other stages alongside this U.S. entry checklist.