1. Aflatoxin
The hemorrhaging is due to the prolonged blood clotting time caused by lack of Vitamin K utilization. An increase in blood clotting time increases the susceptibility of the carcass to bruising even at doses below that to have an affect on growth.
http://www.aflatoxin.info/health.asp

2. Horse Nutrition 101
Serum alkaline phosphatase activity is usually increased, and clotting time may be prolonged slightly. The ammonia and urea eventually are excreted in the urine, which leads to increased water intake, increased urination, and a noticeably strong...
http://home.att.net/~horsenutrition101/index.html

3. Hemangiosarcoma
It uses up all of the blood clotting elements rapidly and dogs with this condition usually have platelet deficiencies, increased blood clotting times, decrease in fibrin content in the blood and an increase in fibrin degradation products (FDPs)...
http://www.vetinfo.com/dencyclopedia/dehemsarcoma.html