Primary hereditary cataract is recorded and described in the German Shepherd Dog in the United Kingdom. The cataract is not congenital, it is bilateral and progressive to a certain point and is unassociated with any other ocular abnormality. It is due to an autosomal, recessive gene.
The cataract is compared to that described by von Hippel in Germany in 1930 which was congenital and non-progressive and due to a dominant gene. The two types of cataract are therefore dissimilar.