38 Dog Breeds That Require Extra Caution and Understanding

32. Black Russian Terrier

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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 taught to guard and protect at all costs. However, things change around small children. Weighing up to 140 pounds, they can unintentionally cause harm due to their size. Take them seriously if you bring one home.