Not sure, but the time should be around 1983,

the name of the club or organization should be the Office of Livestock in Phitsanulok and the Bang Kaew Dog Conservation Club

See details at http://www.bangkaew.org/modules.php?op=modload&name=News&file=article&sid=9&mode=thread&order=0&thold=0

.........“Several villages in the native area of the Bang Kaew Dog had been made accessible by raod, and thus many foreign types og dogs had been introduced which were intermixing with the indigenous breed, “ said Dr Nisit , a veterinarian with the Office of Livestock in Phitsanulok.
When he launched his conservation project, called “Bang Kaew Khuen Thin” ( Bang Kaew Goes Home) in 1983,he visited the Bang Kaew village first.
“I found only a few pure Bang Keaew dogs. I talked to the villagers about my project, but no one was interested. I tried again and again but to no avail, so I left the village.”
Undeterred , the vet visited Chum Saeng Song Kream village instead and he found a large number of genuine Bang Kaew Dog there .Under a joint effect with the village headman and the villager , the conservation project became a reality.
“We formed the Bang Kaew Dog Conservation Club and launched a selective-breeding programme to find the most perfect breeders for the project. To prevent croos-breeding , we encouraged villagers ta raise the native breed, and all agreed,” Pratueng said............