"Oh, I don't know. A cat wouldn't eat nearly as much as a large biped. They could sneak around and spy for you; with nerve-activated weapons you could give it, say, a head-mounted dart gun. And at night, it could just sit on your chest with its tail on your face and purr, purr, purr; bathing you in love and affection."

And the unforgettable aroma of cat farts.