The 38 Most Dangerous Dog Breeds You Should 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 in height and weigh up to 100 pounds. In the 19th century, they were used to deter poachers and were bred as defenders. They may form close bonds with their owners but can become dangerous if not properly socialized or trained.