Most developing and developed countries will have dog catchers to go around collecting street dogs and putting them in cages and even euthanize them putting them to sleep. In Thailand, dogs without homes live mostly peacefully on the streets and are usually fed by the non-owners in the areas and they are also attended to in Thai temples by monks but they are not normally put to sleep. The general view of Thai people is that putting stray dogs to sleep is far crueler than letting them live on the streets or in a Thai Buddhist temple as strays.
Dog accessory shops that sell dog clothes are all over Bangkok and there are even dog hotels just like one in Chongnonsee called Doggiedoo that caters recreational activities such as swimming pool, dog grooming, and dog training.
The affection of Thais for dogs extends to even providing handicapped dogs with wheelchairs for mobility. The disabled dog on wheels in a You Tube video looks in many ways just the same as dogs that are fully capable.