白衣苍狗

Explanation: Cang: pale. Like a white cloud, and instantly became like dark green dog. Analogy fickle things 　　Usage: Joint type; as subject, object; metaphor volatile matter 　　Source: Tandoori Fu "Alas Poetry": "clouds of heaven as white, dark green, such as Sri Lanka need to change the dog." 　　Examples: It is more than ~ capsized, marshes a few changes. ★ Ming Zhang "fly balls in mind Legendary advocate" Thesaurus:  Change Coast Valley, white clouds change into grey dogs,vicissitudes, Bo bay Kuwata, Ebb and flow Ling Gu, Cang dog commoner without rank, Dust the East China Sea