Piracy syndicates have raised the bounty on the heads of two dogs after they helped find millions of dollars' worth of fake DVDs and CDs.

Anti-piracy canines Lucky and Flo struck again on Friday, sniffing out caches of up to 100,000 illegal DVDs in their latest raid, the New Straits Times daily said.

The black Labradors helped enforcement officers seize pirated copies of movies worth more than RM1 million hidden in 11 shops at a shopping mall in Johor, the newspaper said.

On March 20 the two dogs led officers to a hidden room stocked with fake DVDs and CDs worth more than RM10 million in the same mall.

But their success has put them in danger. Malaysian authorities said piracy syndicates were now more determined to kill them and had raised the bounty on their heads from RM10,000 to RM50,000.

Fahmi Kassim, Johor's domestic trade and consumer affairs ministry's enforcement director, said his officers had been attacked by syndicates who were furious that their businesses were threatened, the Star daily reported.

"My men had just finished work for the day when the attack occurred," Fahmi was quoted as saying by the Star .

"If they retaliate because we raid their premises, we will just reinforce our team even more," he said.

Pepper sprayed

Fahmi said some of his men were physically assaulted and hit by pepper spray while in another incident, a Molotov cocktail was flung into the garden of an enforcement officer's home.

The Labradors, which hail from Northern Ireland, are said to be the only ones in the world trained to detect polycarbonate and chemicals used in optical discs.

They were initially brought to Malaysia in February for a one-month trial by the the Motion Picture Association, which investigates piracy for major movie companies.

Their stay has been extended after helping authorities in five successful raids throughout the peninsula, sniffing out pirated DVDs and CDs stored in secret compartments in stores and shopping complexes.