Making old cat & young cat get along?

I have a fat, oldish, spayed female cat, whose chief hobby is sitting
on the window ledge and hissing and growling at any of the
neighborhood strays that wander by.

The neighbors have an adorable half-grown gray and white Siamese.

Recently, the neighbors have moved out, and it looks as though they
may have left, accidentally or intentionally, this cat behind in their
apartment. I've gone ahead and left some food and water for it, and
made sure it has some litter to go in, but now I'm wondering about
what to do if they don't come back for it.

My aunt, a cat-fancier herself, has advised taking it to a no-kill
shelter, and certainly I would do this if there wasn't any other
option. She says that old cats and young cats do not tend to get
along very well at all. But it's such an adorable cat...

I was wondering if there was any way to keep my current cat and this
cat from going at it if I did want to keep the younger one? I don't
know how feasible it is, especially since I have a fairly smallish
apartment, only one litterbox, and I'm away at work for 9 hours of the
day (and live alone).

Any advice, tips, secret tricks? Or would it just be best to give it
up as unfeasible?
--
Chris Meadows aka | If this post helped or entertained you, please rate
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