Japan’s 91-Day Rabies Vaccine Age Rule

TLDR: Japan requires pets to be at least 91 days old at the time of the first rabies vaccination, with the date of birth counted as Day 0. US veterinarians standardly vaccinate at 12 weeks, which is 84 days. Any vaccination given between 84 and 90 days old is entirely invalid with no exceptions, and the entire import process must restart from zero.

The difference between a valid Japan rabies vaccination and an invalid one can be as little as one day. US veterinarians follow AAHA guidelines and routinely vaccinate at 12 weeks, which is 84 days. Japan's minimum is 91 days. A vaccination given at any point between 84 and 90 days old does not meet Japan's requirement and cannot be used.

Most owners do not catch this conflict until after the appointment has already happened. By then, the process has to start over.

What Is Japan's Minimum Age Rule for Rabies Vaccination?

Japan requires pets to be at least 91 days old at the time of the first rabies vaccination. The date of birth is counted as Day 0, which means the pet must reach Day 91 before the vaccination is administered.

This is a strict minimum with no exceptions. A pet vaccinated at 90 days does not meet the requirement. A pet vaccinated at 91 days does. The one-day difference is the entire margin.

Why Do US Veterinarians Vaccinate at 84 Days?

US veterinarians follow guidelines set by the American Animal Hospital Association, which recommend rabies vaccination at 12 weeks of age. Twelve weeks is 84 days. This is correct practice for domestic purposes and is not a vet error.

The problem arises when a US vet schedules a Japan-bound pet's first rabies vaccination using the standard 12-week protocol without knowing Japan's 91-day minimum. The vet is following the correct domestic standard. The vaccination is simply not valid for Japan.

What Happens If the Vaccine Is Given Between 84 and 90 Days?

If a pet receives its first rabies vaccination at any age between 84 and 90 days, the vaccination is entirely invalid for Japan's import process. There are no exceptions to this rule.

An invalid first vaccination means the entire process must restart from zero. The pet must wait until it reaches 91 days old, receive a new valid first vaccination, complete the full two-vaccine protocol, undergo the titer test blood draw, and then wait out the full 180-day import period before it can travel to Japan. The original invalid vaccination cannot be carried forward in any form.

How Do You Calculate Your Pet's Correct Vaccination Date?

Count from the date of birth as Day 0. The first date the pet is eligible for a valid Japan rabies vaccination is Day 91. If your pet was born on the first of the month, Day 91 falls on the second day of the fourth month.

Before scheduling the appointment, confirm the pet's age in days with your veterinarian, not in weeks. Twelve weeks and 91 days are not the same number, and using weeks as the unit of measurement is how this error happens. Ask your vet to confirm the exact date of birth and calculate the earliest valid vaccination date in days before booking.

What Should You Tell Your Vet Before Scheduling the Vaccination?

Before any vaccination appointment is scheduled for a Japan-bound pet, confirm two things with your vet. First, confirm the pet's exact date of birth. Second, confirm that the appointment will not be scheduled before the pet reaches Day 91 using the date of birth as Day 0.

Do not assume your vet is aware of Japan's 91-day minimum. Many excellent veterinarians are not familiar with Japan's specific import requirements and will default to the standard 12-week domestic protocol. Raising this explicitly before the appointment is scheduled is the only reliable way to prevent the error.

Japan's 91-day rule is one of the most common early-stage mistakes on this route, and it is entirely preventable with the right preparation. If you want a team that manages your pet's vaccination schedule and import timeline from the start, our team handles the full process.

Get a free quote from PetRelocation and a relocation manager will walk you through every step.

Frequently Asked Questions

What is Japan's minimum age for rabies vaccination?

Japan requires pets to be at least 91 days old at the time of the first rabies vaccination. The date of birth is counted as Day 0. A vaccination given before Day 91 is entirely invalid with no exceptions.

What happens if my pet was vaccinated at 84 days instead of 91?

The vaccination is entirely invalid for Japan's import process. The process must restart from zero. The pet must reach Day 91, receive a new valid first vaccination, complete the full vaccination protocol, undergo the titer test blood draw, and wait out the full 180-day import period before it can travel to Japan.

How do I calculate whether my pet is old enough for Japan's vaccination requirement?

Count from the date of birth as Day 0. The earliest valid vaccination date is Day 91. Confirm the calculation in days with your veterinarian before scheduling the appointment. Do not rely on a 12-week calculation as 12 weeks and 91 days are not the same number.

Does this age rule apply to both dogs and cats?

Japan requires the animal to be at least 91 days old at the time of the first rabies vaccination. This applies to all animals being imported to Japan under the standard import process.