nine lives

if we watch cartoon in television which the character is cat and mouse and they always have some confrontation. the mice either the cat always try to drop each other. one thing that make me confused, why they never death? for cats there is some belief/myth that they have nine lives in some cultures it is seven.

This myth is believed to be true because cats are supple and swift creatures which helps the cat get out of situations that would be fatal for other beings.Also lending credence to this myth is that falling cats often land on their feet because of an inbuilt automatic twisting reaction and are able to twist their bodies around to land feet first, though they can still be injured or killed by a high fall.
(source : http://en.wikipedia.org/wiki/Cat#Nine_lives)