It is to prevent bleeding in horses.
http://www.thinkythings.org/horseracing/lasixinfo.html
Is it used just as a diuretic in humans? Shortly after ANS died, there was talk about a small amount of blood in the stomach. Do you see any connection?
Only know its use in humans as a diuretic..Hubby, a doc, says in small doses it is used in Pulm hypertension.. its a venous dilator.