What was the original primary utility role for which Rat Terriers were developed on American farms?

Answer

Exterminating pests like rats and mice

The original designation of the Rat Terrier speaks directly to its role in pest control, valued for its tenacious ability to dispatch vermin on agricultural properties.

What was the original primary utility role for which Rat Terriers were developed on American farms?
DogpestbreedcompanionRat Terrier