The Black Russian Terrier was developed in the former USSR by the state for use as a military/working dogs. The breeding stock was largely imported from the occupied countries, especially East Germany. Breeds used in the development include the Airedale Terrier, Caucasian Ovcharka, Newfoundland, Giant and Standard Schnauzers and the now extinct Moscow Water Dog. BRT were bred for working ability, rather than appearance, and early examples only resembled today's Black Russian Terrier in their build and coat type. The BRT was bred solely by the state owned Red Star Kennel until 1957, when some puppies were sold to civilian breeders. These breeders began to breed for looks (as the original was rather plain) while retaining working ability. In time, the breed spread to the Balkans, Ukraine, and Siberia, and later to Finland, Hungary, Czechoslovakia, and the United States.
The breed was recognized by the FCI in 1984. On July 1, 2004, it was recognized by the American Kennel Club [AKC] in the Working Group. The Canadian Kennel Club has the Black Russian Terrier as a "listed" (formally Miscellaneous Class) breed in the Working Group.
According to the FCI standard the male stands 72 to 76 cm and not more than 78 cm at the withers compared to the female’s 68–72 cm and not more than 74 cm. The male weighs between 50 and 60 kg (110-132 lbs), and the females weigh between 45 and 50 kg (99-110 lbs). Nowadays, even larger individuals are tolerated if the dog is well proportioned and retains correct movements. At maturity (over 18 months of age), the AKC standard recommends 27-30 inches for males with the desired height between 27 and 29 inches and 26 and 29 inches for females with the desired height between 26 and 28 inches. A mature male less than 27 inches or more than 30 inches at the withers is considered a serious fault. A mature female less than 26 inches or more than 29 inches at the withers is considered a serious fault. In proportions, a Black Russian Terrier should be slightly longer than tall, a ratio of 9 ½ to 10 being ideal.
Data refer : http://en.wikipedia.org/wiki/Black_Russian_Terrier