《搜神记·卷六》
京房《易传》说： 男女关系不谨慎，那怪异的事情是狗和猪交配，这是违反道德的，国家将有战争。 
京房易传曰： 夫妇不严，厥妖狗与豕交。兹谓反德，国有兵革。 
Jing Fang's "Book of Changes" says: if male-female relationships are not cautious, then the strange thing is that dogs and pigs mate, which is against morality, and the country will have war.