
I had cats at home the first time I went to Thailand, and the second.
Both times I was living in Thai communities, for a month.... as opposed to guesthouses and hotels -and as part of my remit I was looking at and sometimes handling cats, plus there were always semi/feral dogs around where I stayed.
The main issues with dogs I feel, are fungal skin infections from the climate, ringworm or something similar, and also demodex mites, due to their poor immune systems. There might be other parasites which we don't know here.
Ask Soi Dogs.... I truly wish I was able to go and assist them myself... .Personally if I ever did go out there again I'd take spot-ons, plus something like Acclaim or Indorex, and anything else that could help with parasite control. Even more so if i went back to India, which has less access to that kind of thing.