Abstract: Favorable weather was emphasized for good harvest during agricultural civilization, thus rain was highly concerned at that time. Whenever there was a drought, praying for rain was a typical worship ceremony.Various of approaches were applied to pray for rain, including praying for rain via dogs. To explore the origin of praying for rain via dogs will enrich the study of praying for rain with worship ceremonies. Three reasons are concluded in this paper, namely, the influence of dog totem culture, the application of the sympathetic magic in worship ceremonies and phonological phenomenon.