Bought another diffuser and put it downstairs near the prime spot he's
been marking. Did another big clean-up, though I'm worried that stuff
has seeped down past the flooring into the floorboards. Using an
enzymatic cleaner, but the animalark website suggests a cleaner called
"Force". Perhaps we'll have to buy some of that.

I experimentally moved the cat-carrier away from the closet door he's
been marking (blocking the door with the carrier prevents him from
spraying there). We played crazily this afternoon, for an hour or so,
and he went to sleep. About four hours later he woke up, and ate some
food, brought his mouse to play with, and looked out the front window.

A total of about six hours, and he didn't exhibit any of the
scratching, howling behavior that accompanies a spray attempt.

To be on the safe side, we've replaced the cat carrier for the time
being.

The vet examined Louis and found that not only was he ridiculously
healthy, but that he's gained 3 pounds in the last year - and it's all
lean mass (as we say in bodybuilding). He took a urine sample and
found it completely normal.

My vet also mentioned the point one poster made in the previous
thread, which is that stress can create interstitial nodules which
increase the urge to pee.

So, with the house drenched in cat pheremones, our cats both seem
extremely comfortable, Louis hasn't peed anywhere, and I feel the urge
to lick my hands to clean my hair.

More as it develops.

BLink