Tosa is a breed of dog that originated in Japan, specifically developed for dog fighting. Known for their strength and agility, Tosas are large, muscular dogs with a calm demeanor. They are often recognized for their distinctive appearance, featuring a broad head and a short coat. Despite their history, Tosas can be gentle and loyal companions when properly trained and socialized. The breed is named after the Tosa region in Japan, where they were first bred in the 19th century. Tosas are a mix of several breeds, including the Shikoku, Mastiff, and Bulldog. Today, they are more commonly kept as pets and are known for their protective nature and intelligence.