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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 Norfolk Terrier we've compiled 1 test required by Klub für Terrier von 1894 e.V. and 4 additionally recommended tests, drawn from breed-club regulations, the University of PEI (CIDD), and OMIA — weighted by severity and heritability.
View verified breedersWhat this grade means
The Norfolk Terrier is healthy with an average genetic load: A 2014 British health survey of 1,216 Norfolk Terriers found no disease affecting more than 7 percent of the dogs. Conditions to watch for are patellar luxation (PL), cataracts, and ichthyosis. The Klub für Terrier von 1894 e.V. prescribes an examination for patellar luxation (PL) for breeding approval, in which only scores of PL 0–1 are permitted. Responsible breeders additionally have the eyes examined for cataracts via an ophthalmological eye test and test for ichthyosis. When buying a puppy, make sure that the parent animals are clear of cataracts and, regarding ichthyosis, that a carrier was only 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. For the Norfolk Terrier, Klub für Terrier von 1894 e.V. requires 1 test for breeding approval, plus 4 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 4 additional clinically recommended screenings that reduce risk in this breed.
In addition to Good:
Eye conditions (ophthalmological eye exam)(ECVO)
Augen
This refers to a variety of hereditary eye conditions affecting the structures of the eye, such as the lens, retina, or eyelids. An ophthalmological eye exam is a specialized clinical screening used to detect these genetic defects, which include cataracts (clouding of the lens) or progressive retinal atrophy (gradual degeneration of the light-sensitive retina). Early detection through these screenings helps identify issues before they cause permanent vision loss or chronic pain.
Eye examination · Passing: clear
Cataract(HC)
Augen
A cataract is a progressive clouding of the lens inside the dog's eye, which is the clear structure that focuses light onto the retina at the back of the eye. When the lens becomes cloudy or opaque, it blocks light from entering, gradually impairing the dog's vision. If left untreated, this condition can eventually lead to complete blindness in the affected eye.
Eye examination · Passing: clear
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.
Passing: clear or carrier
Myxomatous mitral valve disease(MMVD)
Herz
Myxomatous valve degeneration is a chronic heart disease where the heart valves, most commonly the mitral valve, gradually thicken and lose their normal shape. This structural change prevents the valves from closing tightly, causing blood to leak backward through the heart chambers. Over time, this backflow forces the heart to work much harder, eventually leading to congestive heart failure.
Ultrasound · Passing: normal
Not health tests, but required for breeding: the club asks for these results too. They don't count toward the risks or the rating.
DNA-Identitätsnachweis
Required by Klub für Terrier von 1894 e.V.
Acceptable result: DNA-Typisierung durchgeführt
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 — Patellar Luxation
Both parents must be PL 0–1 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 Norfolk 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 Norfolk 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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