While traveling SE Asia I didn't see that very often.
Besides in some rural areas (and even there), dogs turned into pets as in western "civilization" and their owners didn't want to eat them anymore.
When I was in Hanoi in 2010, in the central districts as unrural as you can get in Vietnam, skinned dog carcasses were hanging at a number of markets. If westernization has had an impact, it must be more recent than that. I’m curious to go back and see for myself.
It contains entries such as Consommé d'Eléphant, Le Civet de Kangourou, and Le Chat flanquè de Rats