a lot of things can cause loose stool, but hair balls are probably not one  
of them. they tend to cause constipation.
 
are you sure she has hair balls? cats with ibd (inflammatory bowel  disease), 
which my Lucy has, can vomit in a way that looks like they are hacking  up 
hair balls, and can also have loose stool on and off.  The best thing  for that 
seems to be home-made diets, and most of all to be consistent and stick  to 
one food.  the most digestible of the store-bought foods for ibd seems  to be 
Innova EVO, which has no grains, as grains seem to irritate ibd in cats.  you 
might want to try that, and not change or add any foods for a while--  
switching 
back and forth is the worst.
 
michelle

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