Iji nweta nkọwa doro anya site na ebe nkịta na-alụ ọgụ, e kewara ụdị ahụ n'ime American Pit Bull Terrier na American Staffordshire Terrier. Akụkụ nke aha "Staffordshire" sitere na ebe ọ malitere na England. Na 1936, American Kennel Club kwadoro ọkọlọtọ American Staffordshire Terrier. Ebumnuche nke ịzụ Amstaff bụ ka ha pụọ na ọgụ nkịta na ime ka ụdị ahụ bụrụ ihe na-atọ ụtọ maka ihe ngosi. Kemgbe Jenụwarị 1, 1972, ụdị a bụ akụkụ nke FCI Group 3 "Terriers" ma kenye ya na ngalaba 3 "Bull Terriers". Na Germany, a na-ahụkarị Amstaff taa, ebe ọ bụ na a ma ama dị ka "nkịta na-alụ ọgụ" na-eme ihe ike.
N'okpuru ị ga-ahụ egbugbu 10 kacha mma Staffordshire Bull Terrier: