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Health Testing Guide
Which tests are mandatory, how to spot responsible breeders — and what it costs when things go wrong.
For the Parson Russell Terrier we've compiled 12 core tests (6 of them required by Parson Russell Terrier Club Deutschland e.V. (PRTCD) - VDH/JGHV) and 5 additionally recommended tests, drawn from breed-club regulations, the University of PEI (CIDD), and OMIA — weighted by severity and heritability.
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In the Parson Russell Terrier, there are breed-typical risks for severe neurological diseases such as spinocerebellar ataxia and late-onset spinocerebellar ataxia (CAPN1), as well as primary lens luxation (PLL) and patellar luxation (PL). The Parson Russell Terrier Club Deutschland e.V. (PRTCD) mandates tests for these diseases as well as examinations for hereditary cataract and progressive retinal atrophy for breeding. A health-oriented breeder additionally checks the eyes for primary open-angle glaucoma and retinal dysplasia. Have the official breeding test results of both parents shown to you: patellar luxation (PL) must be graded as PL 0, and for primary lens luxation (PLL), a carrier may only be mated with a clear partner.
Every breed is susceptible to certain inherited conditions. Just like humans, dogs inherit predispositions from their parents. Responsible breeders screen their breeding dogs for these conditions and make informed mating decisions to reduce the risk passed on to puppies.
No — but it's the strongest tool we have. Diet, exercise, environment, and genetics all contribute to whether a dog develops a condition. When breeders use the right tests to identify risk in potential parents, the likelihood of many conditions appearing in the puppies drops significantly.
There's no one-size-fits-all here. The core standard for the Parson Russell Terrier covers 12 tests, 6 of them required by Parson Russell Terrier Club Deutschland e.V. (PRTCD) - VDH/JGHV, plus 5 additional recommended tests. The specific tests and passing thresholds are detailed further below.
Keep in mind
Reliable screening tests still don't exist for many hereditary conditions, and tests for complex polygenic conditions don't always predict severity in the puppies. Even so, they're a powerful tool of responsible breeding.
There are two main types of health tests:
Screen the dog's DNA for known disease-causing mutations. Can be performed from puppyhood and give a binary result (clear / carrier / affected).
Clinical and imaging exams like X-ray, ultrasound, or ophthalmoscopy. They show how a predisposition actually manifests — usually only conclusive after 12–18 months.
We group breeding programs into three levels based on testing depth. Ask your breeder directly which level they meet.
A breeder at the Great level meets the Good level and performs 5 additional clinically recommended screenings that reduce risk in this breed.
In addition to Good:
Congenital Myasthenic Syndrome(CMS)
Bewegungsapparat
Congenital Myasthenic Syndrome (CMS) is an inherited genetic disorder that disrupts the communication between nerves and muscles. This breakdown in the neuromuscular system prevents signals from reaching the muscles properly, leading to rapid muscle fatigue and weakness. Unlike some other muscle-weakness disorders, this is a congenital condition present from birth and is not caused by an autoimmune system malfunction.
DNA test
Ichthyosis(ICT)
Haut und Fell
Ichthyosis is an inherited skin disorder where the outer layer of the skin, the epidermis, does not develop or shed properly. This defect in keratinization—the process of forming a protective outer skin barrier—leads to a buildup of dry, thick, and scaly skin. Because this barrier is compromised, the dog's body is more vulnerable to secondary infections.
Globoid cell leukodystrophy (galactocerebrosidosis)(GCL)
Nervensystem
Globoid cell leukodystrophy is an inherited metabolic disorder affecting the nervous system, caused by a deficiency in an essential enzyme. This deficiency leads to the buildup of harmful substances that destroy myelin, which is the protective sheath surrounding nerve fibers in the brain and spinal cord. Without this protective covering, the nerves cannot transmit signals properly, resulting in progressive neurological decline.
DNA test
Cerebellar abiotrophy(CA)
Nervensystem
Cerebellar abiotrophy is an inherited neurological disorder affecting the brain, specifically the cerebellum, which regulates balance and movement coordination. In affected dogs, the nerve cells in this region prematurely degenerate and die off. This progressive cell loss disrupts the brain's ability to control smooth physical movements.
DNA test
Urolithiasis
Nieren
Urolithiasis is the formation of mineral stones within the urinary tract, which includes the kidneys, bladder, and connecting tubes. These solid crystal clusters develop when minerals in the urine clump together instead of dissolving. Over time, these stones can irritate the sensitive lining of the urinary system or completely block the flow of urine.
These levels are a comparison framework, not an official certification. They help compare breeding programs at a glance.
A complete checklist with every core-standard and additionally recommended test, plus identity and rearing questions — take it with you.
Open the full checklistFor breeders
Machine-readable mating rules, minimum ages, scoring schemes, and what's required for HonestDog verification — as a printable guide.
Example rule — Ectropion / Entropion
Both parents must be clear or better.
We take mandatory tests from official breed regulations, build the recommended health standard from veterinary databases — and cross-check every uploaded certificate against the dog's profile using AI.
L1 = core standard: the club's required tests where its rules set them, otherwise the recommended health standard for the breed. L2 = additionally recommended or clinically indicated. L3 = lower prevalence. Every assignment carries a source and confidence rating.
VDH breeding regulations, CIDD (University of PEI), OMIA (University of Sydney), curated veterinary input.
Uploaded certificates are read by AI and checked for date, result, and consistency with the dog's profile — our team reviews anything inconclusive.
The Parson Russell Terrier is not currently listed in our extreme-breeding overview. That does not mean it is free of hereditary disease: which ones are typical, and which tests the parents should have, is on this page.
Self-check
Answer 6 quick questions about your everyday life and see how well the Parson Russell Terrier fits you — including an honest cost estimate per month, per year, and across the dog's lifetime.
See breeders who have already uploaded their health test results for verification.
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