Bull-type terriers are a dog sub-type of terriers. It is also a section of the terrier group at the Fédération Cynologique Internationale (FCI).[1][2] All bull-type terriers share the same ancestry in the crossbreeding between bulldog breeds and terriers.[3][4]
Blood sports, once extremely popular, became illegal in England in 1835,[5] but continued to be secretly practiced. Sports such as rat-baiting and dog fighting had grown in popularity because it was easier to hide such events compared to bull-baiting. For dog fighting, the best dogs in these sports (Old English Bulldogs and terriers) were crossbred to produce the bull and terrier, a type with varied appearance but selected for strong fighting traits. This was the common ancestor of the modern breeds that are part of the bull-type terrier group.[6]