Tosa Inu

The Tosa Inu (土佐犬, also called the Tosa-Ken and Japanese Mastiff) is a breed of dog of Japanese origin that is considered rare. It was originally bred in Tosa, Shikoku (present-day Kōchi), as a fighting dog and is the only breed still used (legally) in Japanese dog fighting. Ownership is restricted in some countries as a dangerous breed.