A dog struggled and escaped after being tied up to be slaughtered for meat and ran to a good Samaritan in Chachoengsao's Ban Pho district.
The incident was reported by Watchdog Thailand in a Facebook post on Friday.
Watchdog Thailand write that a local resident was feeding stray dogs lying on the ground near a concrete piles factory in Tambon Saen Phudas when a dog ran crying to her.
The dog's neck was tied with a sling that was attached to an iron bar that the dog had managed to pull out of the ground.
She checked the area and found leftover parts of a slain dog in a plastic bag and evidence of a fire that had apparently been lit to cook dog meat.
The woman alerted the Watchdog Thailand, which in turn alerted the Saen Phudas police station to investigate.
Police suspect a group of migrant workers that set up a camp nearby might have killed a stray dog for its meat and tied up the other dog to kill later.