Dog Surfing
Dog riding a surfboard
Dog surfing has started to become very popular in recent years, mainly in the USA with Florida and California both holding annual dog surfing events.
Dogs are trained to surf using a variety of boards such as bodyboards, surfboards, skimboards and even windsurfing boards. They can either surf completely alone, or with the aid of their owner riding the same board. 
competitive dog surfing is taken very seriously. Dogs are sperated into weight categories and judged on the size of the wave they surf, the length of the surf and their overall confidence on the surfboard. 
More information on dog surfing can be found at the official website of California's Huntington beach dog surfing festival: