Troublesome, costly, at least requires quarantine inspection certificate
1. Bring your dog’s vaccination booklet (any pet hospital’s is fine), take the dog to the local animal quarantine office to process the “Animal Leaving County Certificate.” This certificate has a validity period, and when processing it, you can ask the staff to fill in the date as the day your dog will board the plane.
2. Buy a cage suitable for your dog, either an iron cage or an airline crate is fine. Airlines require the dog to be able to stand and turn around normally inside the cage.
But don’t use an overly large cage, because airlines calculate the shipping fee based on whichever is greater, weight or volume. For example: dog + cage = 20KG, and the box measures 80 x 60 x 60 cm, then the fee is not calculated by weight but by volume/6000. That is, 80*60*60/6000 is the calculation standard. So the cage should just be appropriate, not too large.

3. Arrive at the cargo station 2 hours in advance. If the dog + cage weighs more than 45KG, you need to book the space a day in advance. After weighing, hand over the “Animal Leaving County Certificate” and the “Immunization Certificate” to them, then pay the fee, which is roughly like this. After payment, you will be asked to fill out some annoying agreements, where you must clearly indicate: you bear responsibility if the live animal dies.
Afterward, they will reinforce the cage with wire. Don’t put the dog in the cage too early; wait until the vehicle comes to pick it up before placing the dog inside, otherwise it will be very stressful.
4. Then wait a little while, a vehicle will deliver the dog to the airport cargo area (you can request to ride with their vehicle). Then it will be checked.
After that, you won’t see your dog anymore; the rest is anxious waiting. You need to inform the person picking up the dog of the airline, flight number, and airway bill number, and have them bring an ID to pick up the dog. The dog can be picked up only at least one hour after the plane arrives at the destination.

Before placing the dog in the cage, make sure to give your dog plenty of water, some food it likes, and some comfort, otherwise the dog will be very scared.