What does it mean for a Jack Russell Terrier to be "working"?

The term "working" in reference to a Jack Russell Terrier primarily pertains to the breed’s traditional role in hunting and pest control. Historically, these dogs were bred for their ability to chase and flush out burrowing animals like foxes and rats from their dens, showcasing their keen intelligence, agility, and tenacity. This working characteristic highlights the dog’s instinctive skills and capabilities in a functional task rather than just participation in recreational activities or providing companionship.

While participation in dog shows, performing tricks, or being a companion are important aspects of a dog’s life, they do not encapsulate the specific historical and practical connotation that "working" has in the context of this breed. Thus, understanding the breed's working role enriches the appreciation for its original purpose and abilities, making it clear why the definition encapsulated in option C is the most accurate.