Myotonia Congenita (Miniature Schnauzer)
Myotonia congenita, also known as congenital myotonia, is an inherited muscle disorder identified in Miniature Schnauzers, resulting from a mutation in the CLCN1 gene. This condition causes the muscle cells to become overly excitable, leading to a persistent contraction of muscles rather than the normal relaxation that occurs after voluntary activity.