More than 500kgs of stale buffalo and bull hooves were seized in the central province of Ha Tinh on May 27, according to local police.
Police said they could smell the stale meat when they stopped the car for a check and discovered the hooves stored in eight sponge boxes.
The car's driver said he was transporting the meat from Thanh Hoa Province to HCM City for sale, but he did not have any quarantine receipts or documents proving the origin of the meat.
On May 25, a police patrol also seized more than 200kg of animal fats that had turned stale.
Previously, 13 tonnes of meat of unknown origin was seized in Thu Duc District, HCM City, including 10 tonnes of chicken legs and 3 tonnes of pork.
The meat was being transported from Hanoi to HCM City. The high number of cases of stale meat seized by authorities recently has raised concerns over food hygiene and safety.
Under Decree 45/2005/ND/CP, people who sell stale meat can be fined between VND10-15 million (US$480-715).
More than 970 food-poisoning cases were reported during the last two months, according to statistics from the Vietnam Food Administration.