Many people have not heard of the Japanese Tosa. It is a relatively uncommon breed, and many countries have banned its people from keeping Japanese Tosas as pets, as they have such a bad reputation. Originally, they were bred as fighting dogs. However, most other fighting dogs only fight dogs, and do not bother other animals. Japanese Tosas, however, will fight anything, even their owner. Even proper training will not stop them at times, and once they begin to attack, it is nearly impossible to get them to stop. Therefore, it is highly inadvisable to own a Japanese Tosa if you have children.