SGCD and Duchenne muscular dystrophy: Several well-described forms of muscular dystrophy are found in domestic dogs, with at least fifteen DMD mutations found in over 10 breeds [7–18], as well as two sarcoglycan delta subunit (SGCD) mutations [19], reported to cause dystrophic clinical phenotypes similar to DMD, BMD, and LGMD, respectively, as described in people.