Superstitions on a cat

There are many superstitions surrounding a cat (black cat,in particular). 

• If a black cat crosses your path, it is considered a bad omen while a cat giving birth to kittens at your house is considered a good one.
• A cat crying facing you house is a sign of ill health or even death of a family member whereas hearing a cat sneeze is supposed to bring you good luck.
• If you see black cat early morning then your whole day is ruined.
• Cats are witches in disguise.
• A cat has nine lives.
• If you kill a cat then you have to donate a cat made of gold or else black luck will be until then.

Many of these may be true or may not be.Many people believe in these superstitions while many don't. What I want to discuss now and later is the concept of a black cat being associated with witches. Black cats were considered the 'familiars' which is a friend of a witch. 

Why was it that a cat only was associated with a witch? -Why not a dog or rabbit or any other animal?

Cats were more often associated with evil than other animals because of their nocturnal and independent nature. cats have been a mystery as well as loved by many and hated by others.They have distinct personalities and a seemingly mysterious way and thus have been mistaken for being evil. Also, because of their ability to remain unseen in dark places/night, they were considered an  ideal  witch partner.