Why do cats soil outside the litter box? This can be a complex problem but there are ways to manage it! It is important to remember that your cat does not urinate or defecate outside the box due to spite or anger towards you. Sometimes there is an undiagnosed medical problem and other times it is because the cat’s physical or social needs are not being met. Check out the following like to the American Association of Feline Pracitioners for more information.