Yup they eat dogs in northern Vietnam and in China
Sadly, we’ve never been to Koh Samui. We usually are consumed by “family business” here in the North. We did spend a couple of days in Phuket (way too touristy) on the way to Chiang Mai. The beaches are nice and there are very few “WalMart” bodies. However it was not like it was ten years ago when we last went.