What was the primary historical function of these early terriers in the late 19th century?

Answer

Ratter and general vermin controller

In the late 19th century, the small, determined terrier was an indispensable partner to farming communities, serving primarily as a ratter and general vermin controller.

What was the primary historical function of these early terriers in the late 19th century?
HistoryDogbreedTerrierNorwich