The following Border Collies have been DNA tested for CL.

The test distinguishes between clear, carrier and affected dogs. Clear dogs have no copies of the mutant gene responsible for the condition and will neither develop the condition nor pass the gene on to its offspring. Carrier dogs have one copy of the normal gene and one copy of the mutant gene; they will not develop the condition, but will pass a mutant gene on to approximately half of their offspring. Affected dogs have two copies of the mutant gene that causes the condition and will develop the disease.

Tables listing Clears (in PDF format) are available from the following links:

CL Border Collies Clears

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Dog Health and DNA, Responsible Dog Breeding 

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