What three traits are fundamental to the Jack Russell Terrier's identity due to its working heritage?

Answer

Drive, nerve, and endurance

The JRT's working heritage is fundamental to its identity, emphasizing the drive, nerve, and endurance required to keep up with horses and work underground.

What three traits are fundamental to the Jack Russell Terrier's identity due to its working heritage?

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Fox Terriers, Jack Russells, Tenterfield, Japanese and ... - YouTube

DogbreedTenterfield TerrierJack Russell