Six Rottweilers, two Dalmations and a bulldog were put down by lethal tranquilisers at the poultry farm in Sungai Gadung, believed to the scene of a quadruple murder.
The officers were seen entering the farm at 8.15am and left about two hours later with the carcasses in a pick-up lorry.
According to sources, since the murders were uncovered, the hungry dogs which were left unattended became aggressive and attacked other animals in the farm, such as goats, ducks and chickens.
The source said police had told the district council to catch the dogs but the team despatched to the area decided to put the dogs down as they were aggressive.
The carcasses were taken to the Sungai Sedu landfill in Telok Datuk, near here, to be buried.