I'm sorry I don't have an answer for your specific question (although I
think I would seek a second opinion in this case).  I did want to respond to
your comment about Feliway.  Feliway is used for behavior modification, and
it can be very effective.  However, you will have to spray every day (or
even more often) if you use the spray.  I do keep a can of Feliway spray to
use in the cat carriers.  I think you will find it more effective -- and
easier to use -- if you will buy the Feliway diffuser.  I used 3 of them,
located in various areas, when I adopted a second cat (Duffy); and I think
you would find that more effective than spraying from the aerosol-type
container.  The diffusers release measured amounts on a timed basis, and
they are refillable.  I found that a refill lasted a little more than a
month.  I ordered mine from ValleyVet (http://www.valleyvet.com). They have
better prices than most others, and there is no charge for shipping. The
last time I checked, they listed Feliway for $29.95 for a diffuser with one
bottle of Feliway.

MaryL
(take out the litter to reply)

Photos of Duffy and Holly:      >'o'<
http://tinyurl.com/8y54 (Introducing Duffy to Holly)
http://tinyurl.com/8y56 (Duffy and Holly "settle in")