Health
US and UK breed surveys put the life expectancy of the Norwich Terrier at 13–13.5 years. While the Norwich Terrier is considered a healthy breed, there are some health issues for which responsible breeders do preventative genetic health testing, thereby reducing the incidences.
The Norwich Terrier does have a predisposition for some health issues but studies to determine the exact mode of inheritance or the exact frequency in the breed are unknown or have not been conclusive. At present there are no disorders identified as "most important". Of secondary magnitude, cataracts are recognized as a disorder that has been reported sporadically and may be inherited. Also of a secondary magnitude there are instances of epilepsy, narrow tracheas, luxating patellas, hip dysplasia, mitral valve disease, and incorrect bites (how the teeth meet when the jaws are closed).
Like all dogs, Norwich Terriers can have autoimmune reactivity to rabies vaccinations. Rabies-Vaccine-Induced Ischemic Dermatopathy, or RVI-ID, is a non-fatal but potentially serious reaction to chemicals called adjuvants in the vaccine. RVI-ID is often misdiagnosed, but if correctly diagnosed, is treatable. Symptoms may include: symmetrical dark spots or lesions at the tips of the ears; swelling, hard lumps or dark spots in the vicinity of the injection site.
Higher volume Norwich breeders are seeing more dogs with breathing concerns, and the Norwich and Norfolk Terrier Club (USA) has formed a new "Health and Genetics Sub-Committee for Research on Upper Airway Syndrome in Norwich Terriers". Upper Airway Syndrome (UAS) covers all abnormalities that can occur in the upper airway, including: elongated soft palates; too short soft palates; narrow/misshapen tracheas; collapsing tracheas; stenotic nares (nasal passages that are too small); swollen tonsils; everted laryngeal saccules. These upper airway disorders can occur singly or in combination with one or two others. All compromise the airway and the dog's ability to breathe normally; the dog's breathing often sounds raspy or moist. It may be that shorter muzzles may have increased incidence of such issues.
Norwich Terriers generally have small litters of 1 to 3 puppies. Generally, if a female is healthy, its optimal breeding period is between the ages of 2 (after all genetic health testing is complete - heart, eyes, hips and petellas) and six years. At seven years of age dogs are considered geriatric. The small supply and the high price of a pure bred Norwich Terrier - often around US$2,500 in 2008 - has attracted fraud, as unsuspecting buyers pay full price for Cairn Terriers with docked tails, or mixed-breed puppies.
In Canada and the United States, you can verify if a dog has completed genetic health testing by checking the open registry at www.offa.org.
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