Cat survival

You are a street cat, landed in the besieged town. Your goal is to exterminate rats and other pests which destroy human supplies. Will you become the same parasite or will you be able to improve your skills of hunting and gathering, to overcome hunger, and bring benefit to people? Will you become an easy prey for hungry dogs? Will you fall exhausted under the cold rain or be killed by rat's bites or hunger? But maybe you will learn to craft necessary stuff for survival, make family and become a favorite of all people and animals, get rich and can afford the most expensive clothes?