A cat stepping on milk is a way of happiness and self-comfort. If it steps on your milk, it means that it trusts you and is reassured and not wary of you. At this time, we do not need to panic because it is normal for cats to step on milk. In addition, cats most often step on milk during their growth period, and will reduce or stop stepping on milk after adulthood. Some cats like to step on milk during estrus.