Qoobo may be the perfect cat. It's soft, responsive, and will never scratch, dismiss, or leave you. It's also a robot. Qoobo, which was unveiled this week by Yukai Engineering Co., Ltd. at the CEATAC trade show in Japan is only marginally a cat. Its wagging feline tail is attached to a 2-pound ball of fur. There's no purring face, no head or whiskers, no legs, feet, or claws. The name is a combination of the French word for "tail" and "robot.