38 World's Most Dangerous Dog Breeds You Must Be Aware Of

24. Bullmastiff

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The Bullmastiff is 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 may form close bonds with owners but can become dangerous if not properly socialized or trained.