Nevertheless be VERY careful with 'soi' animals of any sort. It is estimated that in some parts of Thailand 40% of 'soi' dogs test positive for rabies and it doesn't take much for it to spread from a dog to a cat!
I spent 3 years living in Thailand and was unvaxxed against rabies but if I went there again, I would have a rabies vaccine before going.
I didn't see any dogs exhibiting symptoms of Rabies in Chiang Mai where I lived but I certainly did when I was in India where feral dogs are just as common!