FLYING WITH PAO domestic flight papers (what they asked me)

Pao is 6 years old, Shih Tzu male, and we fly from Bangkok to Chiang Mai for my cousin's wedding. First time I think it's easy. It is not so easy. At the check in counter they ask for the vaccine card and the health certificate. The certificate must be issued by a vet within 10 days of the flight, so I went to the vet on Monday for a Friday flight. Price is about 1,000 baht for the certificate plus the check. Make sure the carrier fits the size they say on the airline website. My first carrier was 2 cm too big and they made me buy a new one at the airport. Very bad. Pao must stay in cargo, he cannot be in the cabin. I did not like this but the staff at the counter explained the rule is for all dogs on that airline. Also keep the microchip number ready, they scan it at some airports.