I don't believe black cats are bad luck. They are silky soft and their eyes are so mysteries. And when they rub up against you their purrr can be wonderful. Black cats bring luck if they come to your house.
But some witches apply their power to do their own will without thought of others. The sight of a black cat can be a warning someone is dabbling. The magic below can be used to protect yourself.
If a black cat crosses your path go home and start again. Take twelve steps backwards or turn around, walk backwards past the spot where the cat crossed, and count nine.
If you see a black cat approach you, turn away and, if the cat is gone when you look again you will avoid the spell.
Have a great day!