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.
Myxomatous degenerative valve disease is the most common cardiac disease in dogs and accounts for ~75% of cardiovascular disease in this species; ~60% of affected dogs have only the mitral valve affected, 30% have lesions in both the tricuspid and mitral valves, and 10% have only tricuspid valve disease. In dogs, the disease is age- and breed-related, with older, small-breed dogs demonstrating a much higher incidence.