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The American Bulldog is a courageous dog (Canis lupus familiaris). Though larger in size, they are the closest surviving relative of the Old English Bulldog, because they were not altered to as great an extent while in America as their European cousins. There are generally considered to be three types of American Bulldog, the Johnson type and the Scott type and the “old southern white” named after the breeders who were influential in developing them, John D. Johnson and Allen Scott. These are more commonly known as Classic or Bully type and Standard or Performance type.

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