I-Tosa yaseJapan yavela kuphela phakathi kwiminyaka yoo-1800 kwaye ayisiyiyo inzala. Endaweni yoko, yadalwa ngokudibanisa neentlobo zasentshona. Ezi zenzelwe ukudala izinja ezinkulu, ezihlala zihleli, kunye nezinja zokulwa.
I-Tosa ekuqaleni yinja yokulwa yaseJapan kwaye isasetyenziswa nanamhlanje. Nangona kunjalo, ii-dogfights zaseJapan zahluke ngokupheleleyo kunokuba unokulindela. Ayikobundlobongela, kokona kumalunga namandla engqondo. Amaxesha amaninzi afaniswa neesumo wrestling bouts.
Imilo inemithetho engqongqo. Oku kuquka ukungavumeli izinja ukuba zilumane okanye zilimazane, kunye nokuyeka imilo ukuba izinja ziphelelwa ngumdla. Nangona kunjalo, ukuqeqeshwa ukuze ube yinja yokuhlasela yaseJapan kunzima kwaye kwenzeka kwiinkampu zoqeqesho.