Hi! I have 2 cats, a German Shepard and I'm getting my yorkie in a few days. My best advice is to let them have some time together while also letting them have an "escape route" if they need. My first cat Kaos is my baby and very jealous. When I first brought my other cat, Fuzz, home, she was not happy. they fought for awhile, and Kaos would hide in my bedroom for hours. However, when she realized this was a permanent thing she got over it. Make sure to give your puppies lots of love and attention so they dont feel replaced, but also let them see you love on the cat so they will know that you accept him. If you accept him they will learn to do so too! Just give everyone some time. Hope it all works out!