When I first got her she would urinate on my bed where the other cat sleeps. She did that 3 times, then nothing for months until the fosters came. Millie won't sleep in my room with the other cats, so she's 100% on the ground floor now. That's when the urinating started. We did a standard UA and didn't find anything abnormal, and we also did blood work, and that was all normal as well. I'm not familiar with FIC so it hasn't been on my radar at all.
Many cats present with signs and symptoms indicative of FIC (Feline Idiopathic Cystitis) despite negative lab results. In those cases, it is important to methodically evaluate the health of your cat before ruling-out any underlying illnesses or disorders. In certain cases, a dx of FIC may, in fact, be rendered by
default.
In those cases (where behavioral stress is not a causative factor and a dx of FIC has been delivered by default), you might want to explore different treatment options.
* For instance, it is well-reported that a diet of dry cat food can lead to urinary problems in cats. Although diet might not have anything to do with Millie's episodes of inappropriate urination, it is worth exploring further ... just in case your cat's diet is a contributing factor (and not behavioral stress, such as the presence of other cats in your home).
* Here is a website devoted to urinary problems in cats (it is written by a DVM, who is a feline medicine specialist):
http://www.catinfo.org/?link=urinarytracthealth
* It is also important to mention that FIC (whether a diagnosis of FIC is based on positive lab results or by default) can be extremely painful for cats - and cats are notoriously reluctant to show visible signs of pain. So, if FIC is even remotely suspected, try to make sure your cat is as comfortable as possible. In other words, your cat may not be urinating on your living room carpet as a manifestation of "spite"... and "getting even" is not a natural trait in cats anyway, as noted by
@Rwwilliams above. Instead, Millie may be very ill - and unlike we "speaking" human beings, Millie is unable to "tell" you in words how much her ailment might be hurting her.
*
Finally, these are simply my general comments in response to your earlier posts about Millie. Of course, Millie's veterinarian is in the best position to provide expert advice, care, treatment and counsel.
Thank you.