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The American Staffordshire Terrier is a protector by nature. The basic instinct of this breed of dog is to protect its owner and his family. When they feel that something is threatening their people, they become aggressive and can bite the intruder. Unlike some other breeds, the American Staffordshire Terrier is also capable of guarding family property. This is an excellent combination for those people who want to have a guard dog for themselves and their property.