Squibs and cats

[Lady Luck]

No: HPFGUIDX 82906

I have a bunch of questions that have been bothering me 
for a while. For since the SS/PS I thought that 
there was something up with Filch's cat Mrs Norris.
I use to think that Mrs. Norris was a wizard or a witch
posing as a cat (an animagus). So now in the COS we found out that
Filch is a squib. Ok fast forward to the OOTP, Arabella Figg is the
same Mrs Figg who watched Harry when the Dursleys were away. And
come to find out that she is also a squib with loads of cats.
I was reading the chapter discussion post, and one of Mrs. Figg
quotes was (something to the effect) "I sent Mr Tibbles (her cat)
to look out for trouble, and he came and told me you were in trouble"

Now my questions: 
1) How in the world do these cats tell Mrs Figg or
Mr Filch that there is trouble? 
2) Do squibs have to have cats only or can they have other
animals as well?
3) Do these cats say meow in a special way that only squibs 
understand?

There are more questions but I can't think of any more right now.
If anyone have any more questions or thoughts about this subject 
please reply, I would love to read your responses.

Lucchaser