Definition of primary and secondary amenorrhea. Amenorrhea is the medical term for the absence of menstrual periods, either on a permanent or temporary basis. Amenorrhea can be classified as primary or secondary.
Most inherited bleeding disorders are the result of abnormal platelet function or a deficiency in one or more of the factors involved in the blood clotting system. The most serious and common inherited coagulation disorders in dogs are hemophilia(deficiency of factor VIII or IX) and von Willebrand's disease (lack of von Willebrand factor). Other coagulation disorders are discussed here.
1 Hypothyroidism is the most common endocrine disease in dogs. 2  It can be caused by autoimmune destruction (lymphocytic thyroiditis) or idiopathic atrophy of the thyroid gland. 3  These two causes are responsible for over 95% of the hypothyroidism cases in dogs. Liver failure * is common in dogs. 2  Signs include vomiting, loss of appetite, weight loss, and jaundice. 3  Causes include bacterial or viral infection, toxic insult, cancer, copper storage diseases, or it may be idiopathic.