I was foolish enough to go to a local clinic when I noticed some blood in the urine some years ago. Was given some meds and told to stay off the booze for a while. Shortly after that I had to return to Australia. Similar thing happened, visited doctor to learn I had stage 3-4 bladder cancer. My point is that only highly paid doctors in Thailand will do their job. Go to a reputable private hospital or go back home where lives still matter and that Hippocratic oath still means something. All the best mate 🙏
Keep in mind that almost every dog here is a street dog (mangy, dirty, rabid) whether they appear to have owners or not. Thais do not treat pets the same way we do. It will probably be very stressful and possibly tragic for your dog unless of course it's a vicious pitbull.