Hello
My niece is arriving tomorrow with a 3yr old spayed female cat that she can no longer keep (very sad). We have a 12yr old spayed female cat. Some people advise us to keep the new cat in the spare room and swap food bowls, toys over etc to let them get used to each other for THREE WEEKS!!! Others say to introduce them straight away and let them get on with it. Any advise from you guys? Thanks