Rikiō was Gohē Takeda's hunting dog.
Gohē wanted a strong dog so he chose a Tosa. Gohē fed him bear meat and Rikiō accepted it immediately. One day, when Gohē went on a hunting trip, a bear appeared. Rikiō attacked the bear without hesitation. However, because he did not know what it was like to fear the enemy, he rushed the bear. The bear kills Rikiō by crushing his head with its paw. Rikiō dies immediately from the blow.