Not at all. Black and white cats are very common.
Common diseases in old cats can include: thyoid problems, kidney failure. These can often be fatal and the best way to find out about them is through a blood test at your local vet
The black death
He is a specialist in the diseases of cats.
Black cats grow the same age as any cat. I have two black cats myself. They are no different to normal cats, they can still catch diseases like other cats and will not live (on average) longer or shorter than any other cat. Some people believe black cats live longer but it hasn't been scientifically proven.
They share a common superstition concerning black cats, but not to such an extent as not to adopt black cats...
Not all diseases can be shared between dogs and cats, but there are some such as rabies (through drawing blood) and ringworm that they can get. These are the most common. There are also some fungus diseases, that can easily be cured, and fluenza.
they can have a fever.
one diseases a cat can have is rabies!
Most cats are gray, white or orange-red, some may be black or white.
Probably because so much superstition and folklore involve cats. Think of black cats during Halloween and the bad-luck black cat as examples.