Because cats associate the act of stepping on milk with a sense of happiness and security, when they experience a similar scene again, that beautiful sense of happiness is aroused. In other words, when a cat steps on something soft, it will evoke the memory of stepping on milk in childhood. Stepping on the owner's milk means that the cat has great trust in the owner. It is a way for cats to express their love. ​​​​​​

When cats grow up, although they no longer need to nurse, they feel very warm and secure when they cuddle up next to their owners. At this time, their memories of being a milk cat came flooding back, and they began to step on their owner's milk contentedly. The soft blanket and the owner's belly resemble that of a female cat as a child, creating a scene where the cat once stepped on its breasts.

When the owner gently strokes the cats, they will also feel happy. The beautiful memories of being licked by the mother cat when they were drinking milk in the mother cat's arms are awakened. At this time, cats are more likely to behave like stepping on milk, because in the cat’s mind, stepping on milk = happiness and safety. There is also a special case where female cats in estrus will also behave like milk stamping, which is their behavior to express their desire to mate.