Jack Russell Terrier Health Problems

Ask anyone who's lived with a Jack Russell and they'll tell you the same thing: these are hardy, busy, long-lived little dogs. That reputation is backed by real data. The Royal Veterinary College's VetCompass life tables, published in 2022, found the Jack Russell Terrier had the longest life expectancy of any breed studied in the UK at roughly 12.7 years from birth, ahead of Border Collies and Springer Spaniels and well above the 11.2-year average for dogs overall. So the headline is genuinely reassuring.

That said, "hardy" doesn't mean "problem-free." Like every breed, Jacks carry a few inherited conditions, and a responsible approach to health testing makes a real difference to the odds. None of what follows is veterinary advice, but it should help you ask better questions and spot trouble early.

Eye conditions, especially primary lens luxation The one most associated with the breed is primary lens luxation (PLL), where the lens inside the eye slips out of position. It's painful and can quickly lead to secondary glaucoma and loss of sight if it isn't treated as an emergency. The good news is that PLL is caused by a known mutation (in the ADAMTS17 gene) and there's a reliable DNA test for it, run under the Kennel Club's official scheme. Dogs that inherit two copies of the mutation are very likely to be affected, so testing breeding stock effectively prevents at-risk puppies being produced. Jacks can also develop cataracts and glaucoma, so any cloudiness, redness, squinting or a suddenly painful-looking eye warrants a same-day call to the vet.

Inherited ataxias (wobbliness) The breed is linked to two hereditary neurological conditions that affect coordination and balance. Spinocerebellar ataxia (SCA) tends to show early, often between two and six months, with a wobbly, uncoordinated gait. Late onset ataxia (LOA) appears, as the name suggests, later. Both have DNA tests, and the Kennel Club introduced official testing schemes for SCA, LOA and PLL for Jack Russells back in 2017. A puppy from parents tested clear of these is not at risk of inheriting them.

Patellar luxation (slipping kneecaps) A common one in small, lively dogs. The kneecap pops out of its groove, producing a characteristic little skip or hop, an occasional held-up back leg, or a bow-legged stance. Mild cases are often managed with weight control, sensible exercise, physiotherapy and pain relief; more severe grades may need surgery. There isn't a Kennel Club DNA test for patellar luxation, so it's worth asking a breeder whether their dogs have been checked by a vet.

Legg-Calve-Perthes disease This affects the hip in young small-breed dogs, typically becoming noticeable from around five to eight months of age. The top of the thigh bone loses its blood supply and begins to break down, causing limping and pain that gets worse over time, and it usually leads to arthritis. It's often treated surgically with good outcomes.

Deafness, skin and teeth Congenital deafness is seen in some predominantly white breeds, including Jacks; reputable breeders can have puppies BAER hearing-tested. Atopic dermatitis (itchy, allergic skin affecting the face, ears, paws, armpits and tummy) is fairly common and tends to be a lifelong management job rather than a cure. And like all small dogs, Jack Russells are prone to dental disease, so daily tooth brushing and regular checks pay off over a long life.

Keeping a Jack Russell healthy Most of this is straightforward. Buy from a breeder who DNA-tests for PLL, SCA and LOA (ask to see the certificates), keep your dog lean, brush those teeth, stay on top of parasite prevention and vaccinations, and keep up annual vet checks. A fit, well-bred Jack Russell has a very good chance of being a happy, springy companion well into their teens.

When to see your vet Ring your vet promptly if you notice a red, cloudy, watery or clearly painful eye, or any sudden change in vision, as lens luxation and glaucoma are emergencies. Book a check for persistent limping, a recurring back-leg skip, or a young dog who seems sore in the hip. Get wobbliness, unsteadiness or loss of coordination assessed. And don't ignore relentless itching, ear trouble, bad breath or reluctance to eat. When in doubt, a phone call to your practice is always the safer choice.

Sources - Royal Veterinary College VetCompass, *Life tables of annual life expectancy and mortality for companion dogs in the UK* (Scientific Reports, 2022) - rvc.ac.uk - The Kennel Club, *New DNA Testing Schemes for Jack Russell Terriers* (2017) and breed DNA testing services - thekennelclub.org.uk / royalkennelclub.com - PDSA, breed health and patellar luxation advice - pdsa.org.uk - Animal Friends, *Jack Russell Terrier health problems* - animalfriends.co.uk