The inspection took place at about 1:20 am on Tuesday at an abattoir in Dien Ban Ward owned by Tran Van Quoc, 57, according to local police.
The dogs being slaughtered had no certified legal origin as per Vietnamese regulations.
At the time of the inspection, officers found three men, including Quoc's son, in the process of slaughtering dogs.
Investigators later determined that 29 dogs of unknown origin had already been killed, producing approximately 321.5 kilograms of meat.
The meat was seized along with tools believed to have been used in the slaughter.

Tran Van Quoc points at boxes of fireworks on the second floor of his abattoir in Da Nang, central Vietnam. Photo: Trang Phuong
A subsequent search of the house uncovered six boxes of illegal explosive fireworks, weighing around 10.4 kilograms, stored in a prayer room on the second floor.
Given the seriousness of the suspected violations, police took Quoc into custody on charges of illegal storage of prohibited goods.
Officers said they are continuing to consolidate the case file and expand the investigation.
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