FIV - Feline Immunosuppressive Virus also destroys a cat's immune system. It is transmitted through body fluids and cuts a cat's lifespan in half. FIP - Feline Infectious Peritonitis. Tests and vaccines for FIP are not reliable. Starving to Death - People think that because they have lived in the same house for a number of years that their cat is too smart to wander off and get lost.
People also think that because their cat has never left the front yard that it go any farther.
Getting Trapped - Your cat could get lost in somebody else's garage or utility shed. He could suffer brain damage if trapped in extreme heat or could suffer frostbite if trapped in extreme cold. Research Labs - Your cat could get stolen and sold to a research lab. They might keep your cat or take it to the SPCA where it will be euthanized. Unintentional Poisoning - By pesticides, lawn products, etc.