I was wondering if it was necessary to test for DM through OFA, or if I could use a cheaper test from another source. What are the advantages and disadvantages of each? OFA testing $148 and the other one I'm looking at is only $58, which is why I'm asking. I'm thinking about breeding, and my dog has already passed his OFA Hips and Elbows, so the next test I wanted to do was DM. Thanks!