Animal Protection Act Article 21

21.1 When a pet subject to compulsory registration shows up without human company in a public place or a venue with public access, anyone may assist and guard the pet on the way to an animal shelter or a designated local refuge.21.2 The owner shall be notified promptly if the pet in Clause 21.1 carries an ID tag or chip. If there is no ID tag/chip, or no one comes to reclaim the pet within 12 days, the pet will be disposed of according to Articles 12 and 13.21.3 If the pet in Clause 21.1 has a contagious disease or is in distress, it may be put to death in a humane way.21.4 Clauses 21.2 and 21.3 shall apply in a similar manner for a pet given up by its owner to an animal shelter, or a designated local refuge.
中文原文 動物保護法第21條
應辦理登記之寵物出入公共場所或公眾得出入之場所無人伴同時,任何人均可協助保護送交動物收容處所或直轄市、縣(市)主管機關指定之場所。
前項寵物有身分標識者,應儘速通知飼主認領;經通知逾十二日未認領或無身分標識者,依第十二條及第十三條規定處理。
第一項之寵物有傳染病或其他緊急狀況者,得逕以人道方式宰殺之。
飼主送交動物收容處所或直轄市、縣(市)主管機關指定場所之寵物,準用前二項規定辦理。

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