The Tosa

The Tosa is a Japanese breed of dog, at least 1,000 years old. They were traditionally used for dog fighting, and through the centuries the breed has changed from a small spitz type to today’s large and muscular dog. 


Before the start of WWII there were thousands of Tosa breeders in Japan, but when the country entered the war they made dog fighting illegal. In an attempt to discourage illegal fights, raising dogs of 150 lbs was also made illegal. The breed would have gone extinct, but a few of the most passionate breeders smuggled the last remaining dogs to northern Japan and hid them until the end of the war.

Today, the breed has split into two groups. The Japanese bred are smaller and generally weighs between 80 and 135 lbs. Non-Japanese bred weigh between 135 and 200 lbs. With such a massive size it’s a good thing that they’re known for having a stable temperament. Back in the day when the Tosa was bred for dog fighting they had to be quiet, because Japanese rules demanded silence. To this day they rarely bark, but when they do it’s a deep rumbling sound that combined with the massive size efficiently keeps intruders away.

These dogs are known to be fearless, brave, and intelligent. They are loyal to their family, but like all breeds they require training and socialization.

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