The British Bull Dog was a popular type of solid-frame pocket revolver introduced by Philip Webley & Son of Birmingham, England in 1872 and subsequently copied by gunmakers in Continental Europe and the United States. It featured a 2.5-inch (64 mm) barrel and was chambered for five .44 Short Rimfire, .442 Webley, or .450 Adams cartridges. Webley later produced smaller scaled .320 and .380 caliber versions, but did not mark them with the British Bull Dog name. Designed to be carried in a coat pocket, many have survived to the present day in good condition, having seen little actual use. Numerous copies of this design were made in Belgium, Spain, France, and the USA during the late 19th century. American copies were manufactured by the firms of Forehand & Wadsworth, Iver Johnson, and Harrington & Richardson. Belgian and American versions were also produced in smaller calibers, but all large caliber American copies were chambered for the .44 Webley (.442 British) cartridge.