38 Dog Breeds That Require Extra Caution and Understanding

24. Bullmastiff

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The Bullmastiff represents a cross between a bulldog and a mastiff. They can reach 27 inches tall and weigh up to 100 pounds. In the 19th century, they were used to deter poachers and raised as defenders. They might form close bonds with owners but can become dangerous without proper socialization or training.