when dogs coming from the USA to HK,
even it's for holiday (come & go), you MUST apply for a permit before your dog comes,
OTHERWISE,
your dog is subject to a custody at the airport AFCD kennel for a couple of days,
until you can provide them with the required documents.
and there'll be a charge for keeping your dog at the airport and you might need to travel to & fro your place to the airport when you want to visit your dog.
so, pls follow the procedures and apply for a permit
go to the AFCD website
http://www.afcd.gov.hk/english/quarantine/qua_ie/qua_ie_ipab/qua_ie_ipab_idc/qua_ie_ipab_idc.html
get the permit, prepare the health documents, vaccine records etc.
and if have any problem, call the AFCD airport office or email them
.