Breed library

Jack Russell Terrier

Jack Russell Terrier photograph.
Jack Russell Terrier 1.jpg - Plank. CC BY 3.0. Source: https://commons.wikimedia.org/wiki/File:Jack_Russell_Terrier_1.jpg. License: https://creativecommons.org/licenses/by/3.0. License: CC BY 3.0.

Breed overview

The Jack Russell Terrier is a British breed of small terrier. It is principally white-bodied and may have a smooth, rough, or broken coat, with markings of various colours. It derives from dogs bred and used for fox-hunting in North Devon in the early nineteenth century by a country parson, Jack Russell - for whom the breed is named - and has similar origins to the modern Fox Terrier. Though closely similar, it is a distinct and different breed from the Parson Russell Terrier.

  • Country of origin: AustraliaBreed reference country of origin.
  • Country of origin: United KingdomBreed reference country of origin.

Breed facts

  • The Jack Russell Terrier is a British breed of small terrier.
  • Though closely similar, it is a distinct and different breed from the Parson Russell Terrier.
  • Jack Russells are an energetic breed that rely on a high level of exercise and stimulation.
  • Recognition by kennel clubs for the Jack Russell breed has been opposed by the breed's parent societies - which resulted in the breeding and recognition of the Parson Russell terrier.
  • Jack Russells have appeared many times in film, television, and print - with several historical dogs of note.

Size and appearance

The head should be of moderate width at the ears, narrowing to the eyes, and slightly flat between the ears. There should be a defined but not overpronounced stop at the end of the muzzle where it meets the head, and a black nose. The jaw should be powerful and well boned with a scissor bite and straight teeth. The eyes are almond shaped and dark coloured and should be full of life and intelligence. Small V-shaped ears of moderate thickness are carried forward on the head. When the dog is alert, the tip of the V should not extend past the outer corner of the eyes. The tail is set high and, in the past, was docked to approximately 5 in to provide a sufficient handhold for gripping the terrier. The Jack Russell should always appear balanced and alert. The red fox is the traditional quarry of the Jack Russell terrier, so the working Jack Russell must be small enough to pursue it. Red foxes vary in size, but across the world, they average from 13 - 17 lb in weight and have an average chest size of 12 - 14 in at the widest part.

  • Body mass reference: 5 - 6 kgAdult breed reference quantity from the article infobox. Original value 5 - 6 kg. Unit conversion where applicable: 1 inch = 2.54 cm; 1 pound = 0.45359237 kg. Original field and references are retained in the revision-pinned article evidence.
  • Body mass reference: Up to 6 kgBreed reference body mass. maximum.
  • Body mass reference: 5 kg or moreBreed reference body mass. minimum.
  • Height reference: 25 - 30 cmAdult breed reference quantity from the article infobox. Original value 25 - 30 cm. Unit conversion where applicable: 1 inch = 2.54 cm; 1 pound = 0.45359237 kg. Original field and references are retained in the revision-pinned article evidence.
  • Height reference: 25 cm or moreBreed reference height. minimum.
  • Height reference: Up to 30 cmBreed reference height. maximum.
  • Coat texture: smooth
  • Height category: short
  • Weight category: small

Personality and behavior

Jack Russells are a working terrier. Originally bred to bolt foxes from their dens during hunts, they are used on ground-dwelling quarry such as groundhog, badger, otter, and red and grey fox. To accomplish this, the dog will not bark but will expect attention to the quarry continuously. Because the preservation of this working ability is important to most registered JRTCA/JRTCGB breeders, Jack Russells tend to be extremely intelligent, athletic, fearless, and vocal dogs. Their high energy and drive make these dogs ideally suited to a number of different dog sports such as flyball or agility. Obedience classes are also recommended to potential owners, as Jack Russells can be stubborn at times and aggressive towards other animals and humans if not properly socialized.

  • Attachment and attention seeking (C-BARQ mean): 2.24 / 4Owner-reported attachment and attention seeking factor mean for US reference population Jack Russell Terrier.
  • Chasing (C-BARQ mean): 2.62 / 4Owner-reported chasing factor mean for US reference population Jack Russell Terrier.
  • Dog-directed aggression (C-BARQ mean): 1.50 / 4Owner-reported dog-directed aggression factor mean for US reference population Jack Russell Terrier.
  • Dog-directed fear (C-BARQ mean): 0.88 / 4Owner-reported dog-directed fear factor mean for US reference population Jack Russell Terrier.
  • Energy (C-BARQ mean): 2.30 / 4Owner-reported energy factor mean for US reference population Jack Russell Terrier.
  • Excitability (C-BARQ mean): 2.46 / 4Owner-reported excitability factor mean for US reference population Jack Russell Terrier.
  • Familiar-dog aggression (C-BARQ mean): 0.96 / 4Owner-reported familiar-dog aggression factor mean for US reference population Jack Russell Terrier.
  • Non-social fear (C-BARQ mean): 0.95 / 4Owner-reported non-social fear factor mean for US reference population Jack Russell Terrier.
  • Owner-directed aggression (C-BARQ mean): 0.35 / 4Owner-reported owner-directed aggression factor mean for US reference population Jack Russell Terrier.
  • Separation-related problems (C-BARQ mean): 0.91 / 4Owner-reported separation-related problems factor mean for US reference population Jack Russell Terrier.
  • Stranger-directed aggression (C-BARQ mean): 0.80 / 4Owner-reported stranger-directed aggression factor mean for US reference population Jack Russell Terrier.
  • Stranger-directed fear (C-BARQ mean): 0.69 / 4Owner-reported stranger-directed fear factor mean for US reference population Jack Russell Terrier.
  • Touch sensitivity (C-BARQ mean): 0.94 / 4Owner-reported touch sensitivity factor mean for US reference population Jack Russell Terrier.
  • Trainability (C-BARQ mean): 2.34 / 4Owner-reported trainability factor mean for US reference population Jack Russell Terrier.

Exercise and activities

Difficulty in differentiating the dog from the creature it was pursuing brought about the need for a mostly white dog, and so in 1819 during his last year of university at Exeter College, Oxford, he purchased a small white and tan terrier female named Trump from a local milkman in the nearby small hamlet of Elsfield or Marston. Trump epitomised his ideal Fox Terrier, which, at the time, was a term used for any terrier which was used to bolt foxes out of their burrows. She was the basis for a breeding program to develop a terrier with high stamina for the hunt as well as the courage and formation to chase out foxes that had gone to ground. By the 1850s, these dogs were recognised as a distinct breed.

  • Activity guidance: high energy
  • Activity guidance: active

Training and enrichment

Care planning: choose one everyday skill to practice and keep a record of each session. Note the cue, the reward your dog enjoys and what went well. Rotate familiar games and new activities, and use your notes to choose the next small step.

Coat and grooming

Care planning: use the coat details above to discuss a grooming routine with your groomer. Record brushing sessions, baths and appointments in the app. Add the tools you use and your preferred schedule so the whole household can follow the same routine.

  • Coat texture: smooth

Health and lifespan

A 2022 study of life expectancy of dogs in the UK using veterinary data found the Jack Russell Terrier to have an average life expectancy of 12 years and 9 months, higher than any other breed in the study including crossbreeds. A 2024 UK study found a life expectancy of 13.3 years compared to 12 years for crossbreeds and 12.7 years for purebreds overall. A 2024 Italian study found a life expectancy of 8 years for the breed compared to 10 years overall.

Living with this breed

Care planning: compare this profile's adult dimensions, coat care and available activity information with your household's routine. Make a shortlist, plan who will handle daily care and save the questions you want to ask a breed club, rescue or breeder.

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Breed history

Difficulty in differentiating the dog from the creature it was pursuing brought about the need for a mostly white dog, and so in 1819 during his last year of university at Exeter College, Oxford, he purchased a small white and tan terrier female named Trump from a local milkman in the nearby small hamlet of Elsfield or Marston.

Clubs and further reading

Sources

  1. Jack Russell Terrier - WikipediaWikipedia contributors Retrieved 2026-10-14.License: CC BY-SA 4.0. Adapted excerpts from Wikipedia contributors, Jack Russell Terrier, revision 1376123848. CC BY-SA 4.0. Formatting, citations and selection changed. Source history: https://en.wikipedia.org/w/index.php?title=Jack_Russell_Terrier&action=history
  2. Wikidata structured breed dataWikimedia contributors Retrieved 2026-10-14.License: CC0 1.0. Wikidata contributors (CC0).
  3. National C-BARQ breed and all-breed means from USA.PLOS ONE / Figshare Retrieved 2026-10-14.License: CC BY 4.0. Bohland, Kyle R.; Lilly, Meghan Leanne; Herron, Meghan E.; Arruda, Andréia G.; O’Quin, Jeanette M. (2023). National C-BARQ breed and all-breed means from USA.. PLOS ONE. Dataset. https://doi.org/10.1371/journal.pone.0289356.s003 CC BY 4.0. Selected rows and field names adapted; values unchanged.
  4. File:Jack Russell Terrier 1.jpgWikimedia Commons Retrieved 2026-10-14.License: CC BY 3.0. Jack Russell Terrier 1.jpg - Plank. CC BY 3.0. Source: https://commons.wikimedia.org/wiki/File:Jack_Russell_Terrier_1.jpg. License: https://creativecommons.org/licenses/by/3.0.
  5. Palipaws everyday care planningPalipaws Retrieved 2026-10-14.License: Palipaws original factual summaries. Palipaws. Original care-planning text, separate from breed measurements and licensed article summaries.