Is it safe to have Pekingese Dog travel by plane? From Dubai-Amsterdam-Bangkok? 12 hrs travelling?

I don't think they allow dog flying in penger cabin, even if you take first cl seat so you may have to load your dog into the cargo for animal. I don't think the pressurising system works quite well there! I think you should consult the airline. My previous boss' wife use to take Shivava inflight, but Air France won't allow dog in penger cabin even on the first cl penger.