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.
Structural heart problems may be congenital (the dog is born with a defective heart) or acquired (a structural heart problem develops later in life). Some of the congenital heart diseases in dogs are hereditary in certain breeds of dogs, and include diseases such as 'sub-aortic stenosis', 'pulmonic stenosis', and 'patent ductus arteriosis'.