Maximum mischief in minimum space
Temperament
Pros
Cons
Ancestry
Our best guess, not hard science. These figures come from history and old breeding records, our viewpoint, not proven fact.
Just like owning a car or any other liability, upkeep and maintenance is required — and dog ownership is no different. Particular breeds need more attention from the vet, others have higher grooming costs, while others will eat you out of house and home. We have built this tool to help you understand what to expect from owning this breed.
* Projected figures based on breed-typical UK costs (2026). Individual dogs will vary.
The Lifespan Diagram
A visual guide to how this breed moves through life. The horizontal axis shows age from birth to old age; the vertical axis represents overall function, health and quality of life. The curve rises quickly through puppyhood, holds high during the prime adult years, then gradually declines into the senior stage. The exact shape varies by breed. This is a conceptual illustration, not a clinical or veterinary prediction for any individual dog.
The curve score is a conceptual illustration, not observed veterinary data. Published median lifespan informed the x-axis. The y-axis was generated by piecewise mathematical functions.
Bred by a hunting parson, the Reverend John Russell, in the early 1800s for a game little terrier that could bolt a fox and keep up with the hounds. Tap a circle inside to keep digging.
Suitability
Scores reflect typical breed traits. Individual dogs vary with upbringing and environment.
Exercise needs
Jack Russells are astonishingly energetic for their size. They need more exercise than most people expect.
Typical breed guidelines. Individual dogs vary by age, health and temperament.
Grooming
Smooth-coated Jacks are easy to groom. Rough-coated varieties benefit from hand-stripping twice a year to maintain coat texture.
Typical breed guidelines. Costs vary by location and coat condition.
Training
Typical breed traits. Individual dogs vary with socialisation and consistency of training.
Jack Russell Terriers are a generally hardy breed with good longevity. Their main health concerns are lens luxation and Legg-Perthes disease, which should be screened in breeding animals.
This is a general guide based on published breed health surveys and veterinary literature. Not all dogs will develop these conditions. Always obtain health-tested parents from a responsible breeder and maintain regular vet check-ups.