The Tosa is a large, robust dog breed from Japan, known for its powerful build, broad head, and muscular neck. Originally bred for dog fighting, it is calm, loyal, and protective, often serving as a guard dog. It typically has a short, dense coat and a dignified demeanor.

The term 'Tosa' typically refers to the Tosa Inu, a breed of dog developed in Japan. The Tosa Inu is native to the Kochi Prefecture on Shikoku Island, Japan. This breed is not a wild animal species, but a domesticated dog breed, so its native 'region' refers to its origin of breeding.

As a domesticated breed, the Tosa Inu does not have a natural 'habitat' in the wild. However, it was originally bred to adapt to the temperate climate of Japan, specifically in the Kochi Prefecture. This region experiences a humid subtropical climate with hot, humid summers and mild winters.

The Tosa Inu was bred primarily for dog fighting, which was a traditional practice in Japan. It has been selectively bred for its strength, courage, and protective nature. In modern times, the Tosa Inu is often kept as a guard dog or family pet, adapting well to living environments where it can be active and socialized appropriately.