Hi
welcome to yt is nice to have you here, I have two senior cats a male and a female, when I first got my baby yorkie, I keep them separate, from each other and slowly I introduce them, my hubby try always to keep their nails short, my yorkie is 14 month now and she and my male cat are the best friend ever, my female cat is a Diva she only like us, she tolerate her but she keep her distance
I still keep my eagle eye on them, and when she is alone I still keep them separate too,I had another yorkie for a few weeks here and they did great din't even notice she was a new one
we are all a happy family here