Veterinarian Act Article 39

Failure to surrender the veterinarian certificate, veterinary assistant certificate, practice license, or operation permit that has been revoked or terminated by the deadline shall result in the certificate, license or permit becoming invalid.
中文原文 獸醫師法第39條
受撤銷、廢止獸醫師、獸醫佐證書、執業執照或獸醫診療機構之開業執照,屆期不繳銷該項證書或執照者,註銷其證書或執照。

English translation for reference only; the Chinese text prevails. Not legal advice.