What core personality trait was selected for in terriers needing to work underground?

Answer

Boldness, independence, and an alert nature

The essential duties of working deep underground confronting dangerous animals like badgers required a very specific temperament profile. The terrier needed inherent self-reliance because handlers could not constantly direct them in confined spaces. Therefore, breeders selected for traits like boldness to face quarry alone, independence to make necessary decisions without immediate direction, and alertness to perceive potential threats or opportunities within the den system. This spirited essence remains a hallmark of the modern Westie.

What core personality trait was selected for in terriers needing to work underground?
HistoryevolutionDogbreedTerrier