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をぅとがる: It will rain when washing cat ears. This is a traditional Japanese story.

Cat's forehead, forehead, mouse's peep: literal translation is to put bait on the cat's forehead to catch mice. Actually, it means to set a trap, a Japanese saying.

Cat Tongue Changfeng Donkey Milk: It takes a long time for people who like to take a warm bath.

Cat flea: Cats bite and catch lice with their teeth. Metaphor is that the future is uncertain and you can't succeed if you do things at random.

If there must be any reason, there really is no reason. These are Japanese proverbs, which come from stories and legends. As China people say, for example, if a cooked duck flies, why a duck? Why not a chicken or a bird? A feeling.