Japan Rabies Prevention Law (狂犬病予防法) — Mandatory Dog Registration (Art 4)
Source: 狂犬病予防法 (Rabies Prevention Law, 1950 Law No.247), full statute text from laws.e-gov.go.jp, on disk as pdf-raw/jp-health/rabies_prevention_law.txt. The original-language text — not the English translation — is the verified C1 claim.
This P2 topic records the mandatory dog registration and tag requirement under Art 4 of the Rabies Prevention Law. Every dog owner must register the dog with the municipal mayor within 30 days of acquisition (or within 30 days after the 90th day of age) and keep the issued tag on the dog.
Claims (verified C1 substrings of source_file — original verbatim; English in parentheses)
犬の所有者は、犬を取得した日（生後九十日以内の犬を取得した場合にあつては、生後九十日を経過した日）から三十日以内に、厚生労働省令の定めるところにより、その犬の所在地を管轄する市町村長（特別区にあつては、区長。以下同じ。）に犬の登録を申請しなければならない。(EN: A dog owner must, within 30 days of acquiring the dog (or within 30 days after the 90th day of age), apply to the municipal mayor for dog registration — Art 4(1).)犬の所有者は、前項の鑑札をその犬に着けておかなければならない。(EN: A dog owner must keep the registration tag (鑑札) issued under the preceding paragraph on the dog — Art 4(3).)