LT Hennessy Cognac St Bernard DogOriginal vintage London Underground advertising poster Dogs must be carried but it's easier to carry a pocket flask of Hennessy cognac brandy "Is there a Hennessy in the house?" Great image of a man wearing a smart suit and bowler hat with an umbrella over one arm, carrying a large St Bernard dog up an escalator on the Tube, the dog carrying a small barrel of the alcoholic drink labelled Hennessy around his neck, with small Underground adverts running