[Livia]

Originally Posted by Jay.

I'd put a collar on the cat with a little note saying 'Is this your cat, please call (your number)'

then you can talk to the owner, if they have one.

That's so funny... I was just about to say that. I did this when I lived in London and a cat started visiting and eating my cats' food. I put a collar on him with a note stapled on (safely of course). I had a call from a lovely woman, turned out the cat was a very much loved family pet.