why can black cat represent unlucky?

China
July 24, 2007 9:29pm CST
in many countries,black cat means bad luck,but black dogs rae thought could make bad luck driving away.i want to konow why.is there some story?
2 responses
sherleen
@sherleen (73)
• China
15 Aug 07
I think it's not true...
purple99
@purple99 (165)
• China
15 Aug 07
I think its eyes is very horrific.I don't know the story about it.I think cat is very intelligential and a witch often have a black cat.But it is a common superstition that black cats are unlucky.