Briards may present a condition called congenital stationary night blindness. This genetic disease causes varying degrees of vision loss and night blindness. Affected dogs may experience minor night blindness or some vision loss and have a normal quality of life, while others may lose vision entirely. In order for puppies to inherit the recessive linked condition, both parents must be carriers of the disease.
A DNA test is available to determine whether a dog carries the gene for CSNB—they may test as clear, carrier, or affected. Carriers, or those with affected results should not be bred, but dogs who test clear will not develop or pass CSNB to offspring.