Why is the fox head love rat?

There is no scientific basis for this, but a general phenomenon induction and a subjective judgment on understanding psychology and morality. As we all know, the fox symbolizes the cunning, resourcefulness and temptation of people in fables and humanistic environment, and also symbolizes hypocrisy in a certain sense. Smith and gang are both derogatory terms, so people generally think that people who use foxes as their heads are not stable and honest enough.