get all vaccinations done and get the vet to fill out the forms...
go to 漁農處's web site and get the forms...make sure u have the vaccines and forms done about 14 days prior to ur pet's departure...you'll have to go to a place near the airport and find a person called Dr. Livingstone to stamp ur papers...there's a 20 dollar charge for that...
after you get all these paper work done...you can show them to the airline which ur pet will be using and buy it's ticket...the ticket price is about 1/2 of a ticket for a person