They actually do pretty good together, the 3 of them, until Gracie jumps on Tessa in play. Tessa doesn't care. She doesn't love it, but she just stands there, with Gracie's paws on her, but then Cassie gets upset and starts growling and such at Tessa, not Gracie. I still don't get it. I'm doing my best to redirect Cassie's attention but sometimes, it's very difficult to do, especially because once she starts, Gracie gets super excited and her jumping escalates. She'll even start barking, just because Cassie may be. I try to stay calm, but I end up with Gracie all over the place, Cassie trying alpha Tessa for some weird reason, and Tessa just wanting them to leave her alone.