If you are bringing your pet into Japan, it is best to start preparing as early as possible. If you are coming from regions that are not considered rabies free, it takes at least 6-7 months to import a pet to Japan. Your dog or cat would be required to have a microchip inserted, vaccinated against rabies at least twice and pass the blood test provided by an authorized organization.
You must submit an advance notification form to the Animal Quarantine Service which has jurisdiction over the intended air/sea port of arrival at least 40 days prior to arrival in Japan. For both dogs and cats, it is required to get a health certificate signed by your veterinarian no more than two days prior to arrival in Japan.
For details, refer to the below link;