Shikoku (四国, literally "four provinces") is the smallest (225 km or 139.8 mi long and between 50 and 150 km or 31.1 and 93.2 mi wide) and least populous (3.8 million as of 2015) of the four main islands of Japan, located south of Honshu and east of the island of Kyushu.

Shikoku (四国?) est l'une des quatre grandes îles du Japon avec Honshū, Hokkaidō et Kyūshū.Elles forment avec les archipels Nansei et Nanpō l'archipel japonais

Shikoku (四国 Shikoku, letteralmente "quattro paesi") è la più piccola e meno popolosa tra le quattro maggiori isole dell'arcipelago giapponese. È situata nella parte meridionale ed è vicina al Kyūshū e allo Honshū.

This breed originated in the second half of the nineteenth century. The breed started from the native Shikoku-Inu, an indigenous dog weighing about 25 kilograms (45 pounds) and standing about 55 centimetres high, which closely resembles the European Spitz.