lisa1124 via CatKB.com wrote:
I would love more advice regarding reintroduction. The only place I could
put one would be in a bathroom (where one of the litter boxes is located).
How do I decide which one to put in the small room and how do I keep her from
hating me for doing it?

Rebecca Root wrote:
snip, snip
How can I stop Boo from
being such a bully?

My otherwise peaceful cats became enemies this past summer. After a
trip to the vet to rule out physical causes, I went through the whole
reintroduction process with them: isolating in separate areas and
gradually allowing contact. I used the method on the maxhouse website.
My case was different than yours in that both cats were angry and would
attack each other. It took two rounds of isolation to work it out. The
first time, I was able to reintroduce them after five days and all was
well for a month. The second time, it took a full month to get back to
normal. We've been OK now for almost two months. My cats were triggered
by seeing stranger cats out the window and displacing the aggression
towards each other. If you go this route, I can give you more tips, as
I got a lot of finer points from a behaviorist for the second round.
Good luck.

http://www.maxshouse.com/introducing_cats.htm

try that. he posts here as Phil P. your cat sounds sick. it's sudden
and she's throwing up food. i've seen 2 cats just like that before with
one very overweight and had psycho moods. she had a urinary problem,
crystals in her urine.

the cat won't hate you. cats are smart. she'll realize you are trying
to make things better. of course you may get a dirty look the first day
or two.

Ask others or Phil P. He has some good info although he gets irascible
at times. Maybe if we fed him, he'd be sweeter