The Black Russian Terrier (or simply Black Terrier) is a Russian breed of dog developed originally as a guard dog. It is rare outside its native country and is just starting to be recognized elsewhere.
Male Black Terriers are bigger and more massive than bitches; the male stands 25-29 inches (64-74 cm) at the withers compared to the bitch’s 25-28 inches (64-72 cm) with a tolerance of 1.3 inches (3 cm) or more if the dog is well proportioned. The breed weighs 80 to 143 pounds (36-65 kg)
These dogs have natural guarding instincts and are easily trained. They are lively and even-tempered, but can be wary of strangers.