Do Son Buffalo Fighting Festival is held every year on the 9th day of the 8th month of the lunar calendar. There are, in fact, two rounds of elimination before the middle of the fifth month and 8th day of the sixth lunar month. The Buffalo Fight in Do Son is a traditional festival that is attached to a Water God worshipping ceremony and the “Hien Sinh” custom. The most typical reason for the ceremony is to express the martial spirit of the local people in Do Son, Haiphong.
The preparation for this festival is very elaborate. Fighting buffaloes must be carefully selected, well fed, and trained. These buffaloes must be between 4 and 5 years old, with a good appearance, a wide chest, a big groin, a long neck, an acute bottom, and bow shaped horns. The fighting buffaloes are fed in separate cages to keep them from contact with common buffaloes.