Myopathies can be congenital, hereditary Centronuclear Myopathy This inherited (autosomal recessive) condition is characterized by a type 2 muscle fiber deficiency and is now called centronuclear myopathy. Clinical signs are seen at L-carnitine supplementation... read more , idiopathic Fibrotic Myopathyin Dogs and Cats Fibrotic myopathy is a chronic, progressive, idiopathic, degenerative disorder affecting the semitendinosus, gracilis, quadriceps, infraspinatus, and supraspinatus muscles, primarily in dogs... read more , inflammatory Polymyositisin Dogs Polymyositis is a systemic, noninfectious, possibly immune-mediated, inflammatory muscle disorder in adult dogs. It may be acute or chronic and progressive. Clinical signs include depression... read more , metabolic, neoplastic Muscle Tumorsin Dogs and Cats Primary skeletal muscle tumors can be benign (rhabdomyoma) or malignant (rhabdomyosarcoma). Secondary tumors involved with metastatic spread include lymphosarcoma, hemangiosarcoma, and adenocarcinomas... read more , traumatic Muscular Traumain Dogs and Cats Infraspinatus contracture is a uni- or bilateral fibrotic myopathy of the infraspinatus muscle that is usually secondary to trauma in hunting or working dogs. Initial clinical signs include... read more , or due to nutritional imbalances Yellow Fat Disease in Cats and Other Animals Yellow fat disease is characterized by a marked inflammation of adipose tissue and deposition of “ceroid” pigment in fat cells. It may be seen alone in cats or with accompanying myopathy in... read more .