Most jurisdictions that restrict pit bulls, including Ontario, Canada, and Denver, Colorado, use the term "pit bull" to refer to the modern American Pit Bull Terrier, American Staffordshire Terrier, and Staffordshire Bull Terrier. However, a few jurisdictions, such as Singapore^[3] and Franklin County, Ohio, also classify the modern American Bulldog as a "pit bull-type dog", while in the United Kingdom the term applies only to the American Pit Bull Terrier. All three breeds share a similar history, with origins rooted from the bulldog and a variety of terriers. The term can also refer to dogs that were known as "bull terriers" prior to the development of the modern Bull Terrier in the early 20th century.

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