32. Black Russian Terrier
These strong dogs are all muscle and fur. Do not be deceived by their fluffy coat—Black Russian Terriers are powerful and known for their intelligence and confidence. They have long been trained to guard and protect at all costs. However, their behavior can change around small children. Weighing up to 140 pounds, they can unintentionally cause harm due to their size. Take their presence seriously if you decide to bring one home.