Jack Russells are working hunting terriers bred to chase prey underground, and breed sources are blunt that this drive cannot be trained out — a JRT will typically see the family cat or a hamster as prey — and the breed's stamina, digging, and escape-artist tendencies routinely surprise owners who pictured a small, easy lapdog.
13.3years, median
0.8 years above the all-dog median of 12.5.
Measured, not estimated: the middle age at death across 584,734 UK dogs, 284,734 of them deceased. Based on 32,663 dogs of this breed. 95% confidence interval 13.2 to 13.3 years. Half lived longer than this, half did not. UK dogs, so treat it as the best available figure rather than a promise about yours.
In the same study, small breeds as a group had a median of 12.7 years and medium-muzzled breeds 12.8. This breed is small and medium-muzzled.
McMillan et al. 2024, Scientific Reports 14:531 — open access · CC BY 4.0Health tests to ask the breeder for
There is no CHIC program under the name Jack Russell Terrier. The OFA and the AKC list the Parson Russell Terrier and the Russell Terrier instead, and the Parson Russell Terrier Association of America and the Jack Russell Terrier Club of America publish their own test lists. A breeder who tests will show the certificates; ask for the results for both parents.
- Parson Russell Terrier (OFA/AKC): Patellar Luxation (OFA Evaluation); Eye Examination by a boarded ACVO Ophthalmologist; Congenital Deafness (BAER test)
- Russell Terrier (OFA/AKC): Patellar Luxation (OFA Evaluation); Eye Examination by a boarded ACVO Ophthalmologist; Congenital Deafness (BAER test); Primary Lens Luxation (PLL) DNA test
- PRTAA recommends: Late Onset Ataxia (LOA) DNA test; Primary Lens Luxation (PLL) DNA test; BAER hearing test; yearly CERF/CAER eye exam; Spinocerebellar Ataxia (SCA) DNA test
- JRTCA Health Registry records: BAER; CERF/CAER eye exam; PLL, SCA, DM, LOA, Hyperuricosuria and NNA DNA tests
When to spay or neuter a Jack Russell Terrier: the UC Davis study of 35 breeds has a suggested guideline for the breed. For males it is any age. For females, any age. The spay and neuter page has the numbers behind it and what the guidelines say for a dog this size.
Test names as the club lists them; checked September 2026. OFA CHIC breed page. How to use this at the breeder: check a breeder.
Adopt a Jack Russell Terrier near you
Shelters and rescues list Jack Russell Terriers and Jack Russell Terrier mixes on Petfinder. Enter a ZIP code to see who is waiting within 100 miles.
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Living with a Jack Russell Terrier
This is not a low-key lapdog: Jack Russells need vigorous daily exercise, are notorious diggers and escape artists, and were bred to make their own decisions when hunting underground, which shows up at home as real stubbornness in training. They also tend to be vocal and can be sharp with other pets and small animals, so this breed suits an active household prepared to manage a strong prey drive, not a first-time owner looking for a couch companion. Note that the AKC does not register this breed under this name — its closest AKC counterpart is the Parson Russell Terrier, a related but distinct breed; JRTCA-registered Jack Russell Terriers are recognized by UKC instead.
Health you should know about
- Primary lens luxation — an inherited eye condition (linked to the ADAMTS17 gene) that can cause sudden, painful glaucoma and blindness; a DNA test identifies carriers.
- Patellar luxation — a hereditary kneecap disorder causing intermittent or permanent lameness.
- Legg-Calvé-Perthes disease — degeneration of the hip joint's head, typically appearing between 6-12 months of age.
- Spinocerebellar ataxia — an inherited neurological disorder (KCNJ10 gene) causing coordination problems and seizures in affected lines.
Read the full Dog Care Guide first — costs, daily time, and everything a dog needs before you choose a breed.
Naming a Jack Russell Terrier? British dog and cat names, 89 of them, with what they mean.
Sources — 4 references
Last reviewed October 2026. 4 sources listed below. Written and maintained by Petdeals.io. General care information, not veterinary advice — for a sick animal, call a vet.