I need help from cat owners regarding a recent unpleasant change in the behavior of my cat, Oliver. Two weeks ago, he started urinating at various places around the house. It started with a blanket on my bed, then a comforter, then a pillow, then some dirty clothes in a hamper, then a couch, and in the last few days he has nailed my sheets twice and tonight he nailed my bed again. I have not changed his diet, I have not moved anything, I have not changed his kitty litter, I have not moved the litter box, I have not moved the water dish. In fact, there is no reason at all for this behavior that I can tell.
Since it started, other than doing laundry every day, I took Oliver to the vet to see if he had a urinary tract infection. As he had nailed a blanked five minutes before leaving for the vet, they were unable to get a urine sample, so he went on antibiotics anyway. No change in behavior. The last few days, I have been keeping my bedroom door shut, but today when I came home from work, in the time it took me to change clothes and walk into the bathroom to brush my teeth, he came in and hammered the bed again (missing my last pillow, thank goodness).
My biggest fear is that Tunch is going to start doing the same thing because Oliver is doing this. So, what I need are any suggestions you might have.
*** Update ***
Oliver is neutered and approaching 1 1/2 years old.
*** Update #2 ***
He nailed my bed, with me in it, at 4:49 am. I am not amused.