I think there may be times when 2 males may get territorial with each other...especially if they are not neutered. If they are not, that might be the thing to put on the top of your list.
The water pistol sounds like it might be a good idea to break up the state of mind that they are in while fighting.
I just found this..Maybe it will help..
I have found the loud noise option works when my cats start going at it.
I start by clapping and if that does not work I find something to make a louder noise.
http://answers.google.com/answers/threadview?id=117802
Hi there
First of all, you have a situation which is only a couple of months
old and may yet clear up on its own.
Just to give you some of my background experience with cats, when we
lived in Las Vegas, my wife and I had a total of 42 cats. (not all at
once) Only four of them were our regular "family." Needless to say
we were cat lovers. My wife is now gone, but I still can't live
without a cat. A home without a cat is just another piece of mundane
architecture.
What we did in Vegas was adopt, then adopt. We would go to the Clark
County animal shelter and bring cats home. We would make sure they
were healthy, spayed or neutered if needed, introduced them to being
around other cats. (Our own four became great hosts after a while)
and then find new homes for them. We interviewed prospective kitty
parents and insisted on inspecting the house where the cat would be
taken. We would not allow cats to be adopted by anybody who had a
child or childred under the age of ten. It's not good for the cat and
not good for the smaller kids who might like to play rough. After a
couple of years doing this, it got to the point that the animal
shelter would call us to let us know they had a hard to place animal.
These were usually older cats who for one reason or other had been
left behind by their humans and were usually down in the dumps. Cats
do mourn their losses.
So, handling fighting cats was not unusual. Our own cats pretty much
stayed out of the fray. They just got used to a steady stream of
visitors.
Now when you see two cats fighting, one thing you might do is to pour
some cold water over them . A good soaking will usually break up the
fight. Never reach into a cat fight. I've made that mistake and both
of them turned on the "peacemaker." Needless to say, my tetanus shots
were up to date. Whatever you do, don't hit them with brooms,
newspapers or any other solid object, even if your cat is the one
getting the worst of the situation. Most of the time that only makes
both animals more aggressive and once again one or both may turn on
you once they identify the fact that you are the one holding the
broom.
If you have a cat fight on your hands and don't have any water
available, make a loud noise such as clapping, banging a pan, etc.
Cats hate loud sudden noises and it often will end the confrontation.
One of your cats may smell funny to the other. Sometimes it may take
three or four months to get one cat to accept the scent of another as
'normal,' and will continue to fight till that situation is cleared
up. However, there is a way to clear that up a little faster. First,
rub a towel over one of the cats. Then rub the same towel over the
other cat. Now the cats will smell (kinda, sorta) the same and peace
can be restored. That is the reason kitty never attacks the cat in
the mirror after having seen a reflection once and checking it out.
The cat in the mirror has no scent.
Some people with more than one cat never have a problem with fights,
but others find that their cats are always getting it on in some arena
or other. One reason cats in the same house fight is that there isn't
enough "territory" for each. It's not a question of square feet.
Each cat has his own internal sense of space. In order to satisfy each
animal's need for a separate territory, try repositioning a large
piece of furniture. In other words, rearrange the furniture so that
it breaks up a large space, creating two or three smaller areas. If
each cat has a space of his own, it may put an end to the fighting.
You can create more separate cat spaces in your home by setting up
decorative paneled screens which are available at most furniture
stores. Set one up in a corner to create space front and back.
You can buy a "cat tree" which will perform a similar function. Cat
trees are tall towers with several carpeted shelves. When you bring
one of these trees home, each cat will usually adopt a shelf as its
own. Since the cat then has "its own" space, they are less likely to
fight over territory.
Now if you have tried all of the above and nothing works, you may find
out that by constantly breaking up their fights, you are merely
prolonging the situation. That's because what they are fighting over
has never been settled. It may (and usually is) fighting over who is
to be top cat. And cats don't have any sexist chauvenism. The "Top
Cat" can be either male or female. In that case, settle your nerves,
and let'em duke it out as long as they aren't getting torn to pieces.
A few nose scratches are minor. As for losing an eye, cats have been
fighting for a few million years and one eyed cats are still rather
uncommon. The adds are strongly in your favor that one or the other
will cry uncle and submit before either one gets seriously hurt.
After they have established their boundries (on their own), the
fighting usually ends completely.
Now my own fuzzy named Milo has been sitting on my lap as I'm writing
this (his usual position) and I would swear he's nodding at the
advice. Milo is now 23 and is one of the original four from Vegas.
So, I guess he understands these things.
Search - google
Terms - cat fights, stopping cat fights
Cheers
digsalot