We have a tortoiseshell cat in our garden atm. It looks well fed but is very hungry and very nervous of us. It is wary of our cat Lola but not too wary to try and nick her food. I would like to give it some food and perhaps let it in when it's wet assuming that Lola will accept it.
How do we know that it's not someone else's pet? How do we avoid upsetting someone.