Bull Terrier has two strains - White Bull Terrier and colored Bull Terrier. The origin of this variety can be traced back to 1835. It is widely believed that the breed was bred by the now extinct British white dog. A few years later, in order to meet its appearance standards, the dog was crossed with the Spanish indicator dog, and the genetic characteristics of the indicator dog can still be found occasionally in the dog.

Bull Terrier is raised for gentlemen. Therefore, these gentlemen strongly demand fair competition and don't compete with fraudsters. Bull Terrier is taught to defend itself bravely and protect its master, but it is never allowed to try to challenge - the white variety is called "White Knight", which is its honor.

Source: @dani_coble