The Boerboel [ˈbuːrbul], is a large, mastiff-type dog breed from South Africa that is bred for the purpose of guarding the homestead and working the farm. They are one of the most powerful dog breeds in the world and have an estimated bite force around 800-850 PSI.Boerboel breeding is both a hobby and an industry in South Africa. It should be symmetrical and balanced, following the desired proportions for the breed.