Development of Japanese Native Dogs
From the original Japanese native dogs, six distinct "breeds" in three different sizes developed. They are the Akita (large size), Kishu, Hokkaido, Shikoku, Kai (medium size), and the Shiba (small size). The small-sized dog has been called the Shiba since ancient times, and there are several theories surrounding the development of that name. One popular explanation is that the word Shiba means "brushwood," and the dogs were named for the brushwood bushes where they hunted. Another theory is that the fiery red color of the Shiba is the same as the autumn color of the brushwood leaves. A third conjecture is related to an obsolete meaning of the word Shiba, referring to its small size. These explanations are often combined, and the Shiba is referred to as the "little brushwood dog."
Impact of World War II
World War II nearly spelled disaster for the Shiba, as most of the dogs that did not perish in bombing raids succumbed to distemper during the post-war years. While the Mino and Sanin Shibas became practically extinct, more of the Shinshu Shibas survived. After the war, Shibas were brought from the remote countryside, and breeding programs were established. The remnants of the various bloodlines were combined to produce the breed as it is known today.