Your situation sounds like mine was, when we had only Shaye. She had a serious case of separation anxiety and the minute we tried leaving, she would pee, wherever she was, along with screaming. Everyone told us to get her another b, and when we got Gemma, it was magic. So long as Gemma is with her, she is fine. Maybe Aries just feels more secure with Katie than with Petey. Is Petey less calm than Katie?