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.
Addison's disease, or hypoadrenocorticism, is a hormonal disorder that is typically diagnosed in dogs, and considered rare in cats. In fact, while Addison's disease is still relatively uncommon in dogs, it occurs more frequently than with humans and commonly affects young to middle-aged female dogs.