Black Cats Not Bad Luck. There are some who believe that black cats can be a sign of good things to come. Here are some theories as to why people have said black cats are bad luck… the middle ages instilled the great fear of the black cat in the middle ages before the black death of 1348 ce, the main purpose of cats was to kill mice.
Black cats bring good luck—and bad. Black cats are not bad luck. In the middle ages they were thought to be the assistants of witches, and in the us.
The bombay breed is exclusively black.
The story of the unlucky black cat. Over time, the number of cats grew and they couldn’t even count them so they decided to associate the black cats with this ‘trend’. A black cat that crosses a person's path bestows good fortune and enables the person concerned to make a wish (though the opposite is maintained in the usa, spain and belgium, where white and grey cats are preferred and a black cat brings only bad luck). In some legends, black cats are actually good luck, as is the case in great britain (though not yorkshire!).