Help!
We have a 2 year old Russian Blue that has decided she no longer needs
to use a litter box.  We have had her since May, purchased from a
cattery in NC, and also have an older cat in the house.  The new cat
used the box for a while, several months in fact, and we used Feliway
for a while to help the two cats get used to each other.  About 3
months(or so) ago the Blue started defecating in the tub in our spare
bathroom where we keep her litter box and urinating on the carpet in our
living room.  We have had her to the vet, no sign of crystals in her
urine, the vet gave us anti-biotics anyway which we have given her twice
a day for the last week (with 3 days doses to go).  I am at a loss.  I
have never had a cat that refused to use its litter box and have tried
setting up two boxes for her in case she didn't like peeing where she
pooped.  Any suggestions?

Alan S.