translation.en: This tips into the territory of mental illness when you do things like compulsively over-wash your hands or paws, or you develop a ritual that's so extreme that you can't sit down to a bowl of food unless you engage in that ritual.
translation.zh: 这就进入了精神疾病领域 当动物强迫地过度洗手或洗爪子， 或发展出极端的仪式行为 以至于心满意足之前 都不能坐下好好吃饭。