What are the regulations for pets traveling abroad from Hong Kong?

Hello, according to the General Administration Order No. 146 "Measures for the Quarantine Management of Entry-Exit Personnel":

If you bring companion animals out of the country, the departing personnel must provide companion animal vaccinations in accordance with relevant regulations. Certificates and related certificates, certificates, etc., I and my companion animals will go to the designated inspection and quarantine agency to apply for inspection. Inspection and quarantine personnel will conduct clinical quarantine, and an "Animal Health Certificate" will be issued to those who pass the quarantine. If the importing country or region has other quarantine requirements for outbound companion animals, the outgoing personnel shall apply, and the inspection and quarantine agency will implement quarantine and issue relevant documents in accordance with relevant regulations.

I hope your question has been answered.