Additional: If the dogs are released after sterilization and health check - how does anyone know if the dogs are biters? And what stops the dogs contracting rabies or other diseases after being picked up the first time?
The dogs need to be removed and not returned.
The story goes that Thais cannot afford the health care for their pets, and turn them loose if the animal is unwell, then get a new one. Or if they move areas, the dogs are left (cats as well).
Wherever the dogs are, their excrement washes down into the sea, polluting beaches, and the sand is filthy and possibly contains mites and fleas.
Food dumped all over the place attracts vermin, and then the plastic and foam containers make the place look bad - (difficult enough looking at some of the tourists who could be advertising for Funeral Homes and what happens if you do not look after yourself.
Therefore, any policy must ensure animals are registered and chipped for identification, fines are levied / enforced against owners with roaming and off leash animals. That includes for foreign owners breaking common sense pet ownership requirements.