Have you ever been asked the question, are you a cat or a dog person? If you have chances are you picked dog. Cats are often associated with being fat and lazy (thanks to Garfield) which some cats are. However how do you think they came up with the term "cool cat?" There must have been at least one at some time. This is how I think they all disappeared.
I think that the cool cat came from Antarctica. They chased as many birds as they liked (stupid penguins don't fly away). Penguins were no problem because these cats loved the water. One day all of the cool cats, except 4, were eaten by some scientists on a journey to the south pole. They took the other 4 with them and sent 2 to Africa and 2 to Asia. The cool cats quickly adapted to their environment and became the 2 coolest cats in the animal kingdom, the lion and the tiger.
Little did the scientists know, two cool cats were not found. They were the two most overweight and laziest cats of them all. Using their cool cat telepathy (because they were cool like that) they realized that their lost companions were on entirely different continents. The last cool cats tried to swim to Africa, but they were too fat and lazy to make it all the way. These last two made it to a small island where they were discovered and bred to be the common house cat. Cats love fish because that's all the last cool cats had to eat on their failed journey to Africa.