Crooked dog, Former gantry crane in Crange, Herne, Germany

The Crooked Dog was a gantry crane at the Westhafen in Herne-Crange on the Rhine-Herne Canal. It was one of three nearly identical electric bridge and luffing cranes installed in 1927 and was officially designated Crane 4. It was dismantled on 13–14 March 2012.

This crane was built during the height of the Ruhr region's industrial boom and spent decades moving heavy loads for factories. After it stopped working, the structure received protection as a heritage monument to preserve its industrial significance.

The nickname "Krummer Hund" (Crooked Dog) refers to the crane's slanted appearance, which came from its design as a bridge-and-tipping crane rather than from damage. Officially listed as Kran 4, it was one of three near-identical electric cranes installed in 1927 at the Wanner Westhafen. Local groups such as the Gesellschaft für Heimatkunde Wanne-Eickel and the Verein Haus Crange campaigned for its survival.

The crane stood at the Westhafen in Herne-Crange on the Rhine-Herne Canal, where the harbour basin was later filled in and a container terminal built. It was dismantled on 13/14 March 2012, so nothing of the structure remains on site; the terminal opened on 6 February 2013.

The crane was officially listed as Kran 4, one of three near-identical electric bridge-and-tipping cranes installed in 1927 for the Westhafen coal harbour. It was struck from Herne's monument list at the end of 2011 and taken down on 14 March 2012 to clear the site for a container terminal.