to say it correctly: when You apply for the permit of import, they ask for the copies (PDF) of the dogs passport. I don’t remember if they also checked the original by arrival, I just gave them the complete pile of papers.
Don’t mind me completing the list: Animals International Passport with the obligatory vaccinations recorded in a certain defined period before entering Thailand -rabies third Jab must be at least given more than 3 weeks before, if I remember well.
Stuff at Department of Livestock Development at the airport is very friendly btw.