A German sniffer dog called Lucky turned out to be anything but for a 21-year-old stoner in Munich who was arrested with a homemade Advent calendar with cannabis behind each little door instead of chocolate.

Police knocked on his door to check the man's driving licence, but after noticing a small piece of cannabis on the kitchen table, they set Lucky to work to see if there was any more of the drug.

"Behind every little door (on the calendar) was a small amount of cannabis in a matchbox, wrapped up in a colourful bow," police said in a statement today. "He said he had been given the calendar as a present."

The young man was released but now faces charges of possessing drugs.

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