There is a legend in Austria about black cats and wine. It goes like this...once upon a time a servant was always sneaking into the wine cellar to drink from the barrel of the best wine. The owner of the wine set a black cat upon the barrel to scare away the servant. So, it became a tradition in wine cellars to find a black cat sitting on the best barrel. This black cat statue is in the Loisium Wine Cellar tour in Langenlois, Austria. (very dark in those tunnels).
Another version of the legend is that fermenting wine creates heat and the cats like to sit on the warm barrel. The warmest barrel has the sweetest wine.
Cheers! Zum Wohl!