The Tosa was originally developed in the Tosa region of Japan. These days, the area is referred to as the Kochi prefecture.
At first, the Tosa was bred with the intention of being a fighting dog. They originate from the Shikoku-Inu breed, which was subsequently cross-bred with a selection of European dog breeds that include the Saint Bernard, the Bull Terrier, and the Mastiff.
It should be noted that, in certain countries, the Tosa is officially banned, with the United Kingdom, New Zealand, Denmark, Norway, and Australia all considering the dog to be dangerous.
Since 1997, the Tosa has been recognized by the American Kennel Club as being included in the organization’s Foundation Stock Service category.