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.
von Willebrand Disease (vWD) is the most commonly inherited bleeding disorder in dogs and has been reported in over 50 breeds, but it is most prevalent in the Corgi, Doberman Pinscher, German Shepherd Dog, German Shorthaired Pointer, Golden Retriever, Shetland Sheepdog and Standard Poodle.