We have tested all of our Collies for PRA-prcd2 & DMS. The results are that all of our active breeding Collies are non-carriers for PRA-prcd2. PRA-prcd2 is the PRA test unique for Collies. All of our Collies are also Low Risk for DMS. DMS is the abbreviation for Dermatomyosis. DMS is an autoimmune disease resulting in the degeneration of skin and muscle. For more information, you can read more about each test on the Collie Health Foundation`s website.