What was the original utilitarian function for which both the Norfolk and Norwich Terriers were developed?

Answer

Controlling vermin, specifically rats

Both breeds were created to be rough-and-tumble farm dogs, excellent at controlling vermin, especially rats.

What was the original utilitarian function for which both the Norfolk and Norwich Terriers were developed?

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Norfolk Terrier vs Norwich Terrier - Differences

Norfolk Terrier Vs Norwich Terrier - What are the differences

NorfolkDogbreedTerrierNorwich