The Jack Russell Terrier was developed in the 1800's in Southern England by their namesake Reverend John Russell (he was known to friends as "Jack"). He was an enthusiastic fox hunter, and wanted to create a hunting dog that was able to oust foxes from their dens, allowing the fox hounds to chase them.

Soon, the breed became very popular with fox hunters and was widely used as a hunting dog. Due to their "tempered aggressiveness" and high energy and stamina, they made an ideal hunting dog.

In the United States, there has been much debate over the function and naming of this breed of dog. Depending on the breed association they are either Jack Russell Terriers or Parson Russel Terriers, and each "breed" has its own organization behind it. The Jack Russell Terrier Club of America considers them a working dog, and the Parson Russell Terrier Association of America considers them a show dog.

According to the American Kennel Club (AKC), they are known as simply "Russell Terriers" and were accepted into the registry in 2012.

Height: 14 inches (male); 13 inches (female)

Weight: 14 - 18 pounds

Coat Colors: White with black or tan markings

Markings: Black or tan markings, especially around face/ears

Conformation: Flexible, moderate length. Height proportionate to weight. Large teeth. Strong neck.

Common Uses: Hunting, showing

Temperament: Aggressive, energetic

Place of Origin: England