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Japanese Fighting Dog

Size: Giant

Weight: 88 - 200 lbs.

Height: 24" - 26"

Life Span: 9 - 11 years

Health Problems: Bloat; eye problems; hip dysplasia; joint problems

Origin: Japan (1800s)

Also Known As: Tosa Inu, Tosa Ken, Tosa Fighting Dog, Japanese Mastiff

Group: Guardian / Herding

Category: Companion Dog, Guard Dog

Exercise Needs

The Japanese Fighting Dog should have a large fenced-in area for romp and play. This dog generally looks after its own exercise needs if given enough room, but will appreciate occasional jogging. However, do not jog with a puppy under the age of one-year. As with most giant breeds, over-exercising puppies can interfere with proper growth and development of bones and joints.

Grooming Needs

No special grooming requirements.


The Japanese Fighting Dog is loyal, protective, calm and patient. The breed is good with other dogs and pets only if raised with them from a young age. It is not advisable to keep other dogs of the same size and temperament, because the Japanese Fighting Dog will fight -- and usually win. Due to its background as a fighting dog, this breed is fearless, bold, and often intimidating. However, the breed is highly intelligent and trains easily. It is devoted to its family, but is usually wary of strangers until properly introduced. Owners must make it clear that visitors are welcome so the dog does not go into protection mode. While Japanese-bred dogs are smaller in stature (66 - 88 lbs.), dogs bred in the U.S. and Europe are much larger (100 - 200 lbs.). Due to the breed's potential to get extremely large, unruly dogs cannot be tolerated. Experienced training and handling is absolutely required.

Compatibility with Kids

With proper training and socialization, the Japanese Fighting Dog may learn to tolerate kids. However, its size and natural temperament is not ideal for families with children.


The Japanese Fighting Dog was originally developed for competitive dog fighting in Japan. Dogs were expected to fight silently, without cowering. Over time this training has led to the serious, brave temperament of today's breed. It is believed that the Japanese Fighting Dog descends from a wide mix of the Shikoku, Mastiff, Bull Dog, Bull Terrier and Great Dane.

Dog Food for Your Japanese Fighting Dog

Large Breed Puppy 15 lb. Front Counter

Large Breed Puppy

Lower protein and fat levels than our Puppy Select Formula.

Large Breed Adult 15 lb. Front Counter

Large Breed Adult

Carefully formulated for the care and nutrition of large breed dogs.

Reduced Fat 6 lb. Front Counter

Reduced Fat Formula

30% less fat than Bil-Jac Adult Select.

Sensitive Solutions Skin & Stomach Support 6 lb. Front Counter

Sensitive Solutions Skin & Stomach Support

Features the SmartDefense™ System, with vitamins C & E.

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