Domin a zana madaidaicin ƙayyadaddun ƙayyadaddun yanayin kare fada, an raba nau'in zuwa cikin Pit Bull Terrier na Amurka da Staffordshire Terrier na Amurka. Sashin sunan "Staffordshire" ya fito ne daga wurin asalinsa a Ingila. A cikin 1936, Ƙungiyar Kennel ta Amurka ta amince da matsayin Staffordshire Terrier na Amurka a hukumance. Manufar kiwon Amstaff shine a nisantar da kare kare da kuma sanya nau'in abin sha'awa ga nune-nunen. Tun daga Janairu 1, 1972, nau'in ya kasance wani ɓangare na FCI Group 3 "Terriers" kuma an sanya shi zuwa Sashe na 3 "Bull Terriers". A Jamus, ba a cika samun Amstaff a yau ba, saboda sananne ne a matsayin "karen yaƙi" mai tsauri.
A ƙasa zaku sami 10 mafi kyawun jarfa na Staffordshire Bull Terrier: