This is in response to the recent post by a person with a multiple animal
household including a male ferret with a possible urinary problem (sorry I
didn't note your name!)
 
Having a multiple animal household can complicate the monitoring of the
food/water consumption and bowel/bladder output of the individual animals.
One way to get around this is to simply periodically confine one animal
apart from the group.  Doing this on a rotational basis will enhance the
quality of the information your vet will likely seek from you about the
animal.
 
Getting back to the ferret in question, I assume you already had him
examined by a vet.  I hope nothing serious was found.
 
     Irene & Koto, Etsu, Yuki, Moxie, and Mikey
[Posted in FML issue 1322]