[1] The coat is characterized by its short and smooth appearance and is often red, brindle, or fawn, but occasionally it can be a dull black.

In Japan, they are considered the equivalent of Sumo wrestlers and are even depicted in wrestling accoutrements.

The breed started with the native Shikoku-Inu (an indigenous dog weighing about 25 kilograms (45 pounds) and standing about 55 centimetres high).

These dogs were crossed with European dog breeds, such as the Old English Bulldog in 1872, the English Mastiff in 1874, the Saint Bernard and German Pointer in 1876, the Great Dane in 1924, and the Bull Terrier.

[5] A specific exemption from a British court is required to own and import Tosas legally in the UK.