"know of" and "know about" are somewhat interchangeable. In very general terms "know about" tends to be used in situations where specific information is either being sought or provided, while "know of" is used where more general, non-specific information is in question.
Answer:
The cat likes to eat the <em><u>mouse</u></em>
Al gato le gusta comerse al <u><em>ratón</em></u>
