A dear friend from UK gave me a wonderful book called Cairo Cats, Egypt's Enduring Legacy by Lorraine Chittock. The book is full of great stories, haunting photographs and fascinating quotes about cats in Egypt. My favorite story is this one.
"A cat once killed a snake that was attacking the Prophet. Grateful, Muhammad stroked her back - hence cats never fall on their back. He also put his noble hand on her forehead and that is why every cat has four dark lines on her forehead."
--tradition of the Prophet quoted by Jalaluddin Rumi(d.1273)