A cannabis factory was discovered above a disused restaurant after a dog was electrocuted as it cocked its leg against a shutter.
The Jack Russell was killed instantly by the electric current as it "marked its territory" outside the former eatery where secretly a drugs empire was being masterminded.
The pet's owner, a woman in her thirties, was taken to hospital for treatment after also suffering an electric shock, but she was not badly hurt.
Firefighters sent to the scene in Fairfield, Liverpool, forced their way into the premises with an angle grinder - and then discovered a massive haul of cannabis being harvested.