The AKC has grouped all of the breeds that it registers into seven categories, or groups, roughly based on function and heritage. Breeds are grouped together because they share traits of form and function or a common heritage.
The Tosa is quietly affectionate with his own family, but may be somewhat aloof with strangers. This breed is also, by nature, watchful of other dogs and may react aggressively to dogs it considers intruders. Overtly aggressive behavior towards humans is uncharacteristic of the breed. Their short, dense coat can be fawn, red, apricot, black or brindle and they can also have white markings on their chest and feet. In addition, Tosas mature slowly and individual dogs may not reach their prime until as late as four years of age. This breed is the largest of all Japanese dog breeds. They are also known as the Tosa Ken, Tosa Dog, Tosa Token, Tosa Inu, Japanese Fighting Dog, and Japanese Mastiff.
The Tosa should do well on a high-quality dog food, whether commercially manufactured or home-prepared with your veterinarian’s supervision and approval. Any diet should be appropriate to the dog’s age (puppy, adult, or senior). Some dogs are prone to getting overweight, so watch your dog’s calorie consumption and weight level. Treats can be an important aid in training, but giving too many can cause obesity. Learn about which human foods are safe for dogs, and which are not. Check with your vet if you have any concerns about your dog’s weight or diet. Clean, fresh water should be available at all times.
The Tosa’s short, dense coat requires little grooming, and the occasional brushing will suffice. Beyond that, the occasional bath will keep them clean and looking their best. Their strong, fast-growing nails should be trimmed regularly with a nail clipper or grinder to avoid overgrowth, splitting, and cracking. The ears should be checked regularly to avoid a buildup of wax and debris, which can result in infection. Teeth should be brushed regularly.
Tosas are, by nature, a rather calm breed, though even low-energy breeds need some exercise in order to maintain a healthy weight and get mental stimulation. Options for exercise could include run time in the backyard, preferably fenced, or being taken for walks. Exercise can also come in the form of indoor activities like chasing a ball rolled along the floor or learning new tricks. Certain outdoor activities like hiking or retrieving balls can provide a good outlet for expending energy, too. Training for dog sports like agility, obedience, and rally can also be a great way to give your dog exercise.
The Tosa responds best to positive-reinforcement training methods because of his inherent desire to please his owner.
Some dogs may be faced with health challenges in their lives, but the majority of Tosas are healthy dogs. Working with a responsible breeder, prospective owners can gain the education they need to learn about specific health concerns within the breed.
| Description | Standard Colors | Registration Code |
| Black | Check Mark For Standard Color | 007 |
| Brindle | Check Mark For Standard Color | 057 |
| Fawn | Check Mark For Standard Color | 082 |
| Red | Check Mark For Standard Color | 140 |
| Description | Standard Markings | Registration Code |
| White Markings | Check Mark For Standard Mark | 014 |
