Yes its inexpensive in Thailand not just for animals but for human as well.
I believe in Thailand animals going to hospitals are give better care compare to Singapore animal hospitals. I used to pay alot for my dog while in Singapore. After we moved here with the dog of course, we found that animal care is about half for major stuffs and less than half for common stuff like vaccination, dental etc etc. Most are pretty well equipped and some even has rooms for owners to stay with pets, for this its like $80 per night.