Screening Scheme Description

DNA test - CHG
Congenital Hypothyroidism with Goiter

Details about the disease

Congenital Hypothyroidism with Goiter (CHG) is a condition which prevents the body from effectively producing thyroid hormones, which are required for development and growing. A delay in growth may be noticed around 2 weeks of age, when unaffected puppies undergo a growth spurt.

Clinical signs

Affected puppies may suffer from fits or may die at a very young age. Puppies that are carefully nursed may have a delay in the age at which their eyes and ear canals open, while hearing and brain development may be effected. The thyroid gland can become enlarged and will often appear as a swelling on the throat, known as a goiter. Puppies that survive may have irreversible dwarfism.

How it is inherited

The disease is described as an autosomal recessive condition. This means that a dog must inherit two copies of an abnormal gene (one from its mother and one from its father) before its health is affected. A dog that inherits only one copy of the abnormal gene (from its mother or its father) will have no signs of the disease, but will be a carrier and may pass the gene on to any offspring.

Which laboratories test for this condition?

A list of laboratories and DNA tests can be found at the following link

How to responsibly breed from your DNA tested dog

If, once your dog is DNA tested, you would like to find out what their DNA test results mean, or how to select the right mate to avoid producing affected puppies, then please read our breeding advice and information on the following link

How to find out if a potential mate has been DNA tested

The Kennel Club’s “Health Test Results Finder” allows you to find the results of DNA tests carried out as part of official Kennel Club DNA testing schemes for any dog on the Kennel Club’s breed register. To access this free health tool, please follow this link


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