Some horses (bleeders) when racing would start bleeding from the lungs, lasix was given to these horses to control bleeding. Not sure about now, but years ago when my family was in the racing business, lasix usage was only legal in certain states.
Yes, ...and bleeding into the lungs would (to a layperson like *me*) be associated with...coughing.
Thanks for jogging my memory.
The circle is complete.