What are the regulations for flying with service dogs from Phuket to Koh Samui?

The user inquired about the possibility of flying with service dogs from Phuket to Koh Samui, as they are relocating to Thailand from the US. Responses indicate that Bangkok Airways operates in Koh Samui but there is uncertainty about pet policies on domestic flights, with some suggesting dogs may need to travel in cargo. Nok Air may allow small dogs but typically not in the cabin. Additionally, there are concerns about international regulations on service animals, and the potential rabies risk in Thailand could complicate the return to the US.