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The Irish Bull Terrier (also called Irish Staffordshire Bull Terrier) refers to a type of dog believed to be a hybrid descended from an early cross between the Bulldog and Black and Tan Terrier, which produced the Bull Terrier and Staffordshire Bull Terrier, the former bred primarily to control vermin, and the latter to be fighting dogs.
Background
A 2002 article published in The Telegraph, quoted Beverley Cuddy, then editor of Dogs Today, who called the breed complete fiction, stating that "There is no recognised Irish Staffordshire bull terrier breed." Some believed the breed was invented to circumvent the United Kingdom's Dangerous Dogs Act 1991, and that the "new dogs" were being developed by British dog breeders for use in illegal dog fights. Dogs were being sold under the code name, "Irish" Staffordshire bull terrier, or "pit bull". They were described as looking very much like the American Pit Bull Terrier that were previously banned from the UK.
Not a breed
The Irish Bull Terrier is not recognized by any notable kennel club or breed registry. Some suspect the dogs are American Pit Bull Terriers with an Irish nomenclature to circumvent the breed-specific legislation bans. The RSPCA said that "the 'Irish' variety - which it does not recognise as a breed" contributed to a rise in incidents of dog fighting at a level equivalent to that of the 1980s.
Darcy, Jonathan. (2010). DEAD GAME: Irish Strong Dogs of Old. Darcy Books. (Darcy's book provides the history and evolution of the Irish Staffordshire Bull Terrier.)