Can anybody help me with this? I have a 2 year old spayed female cat. She started hissing and growing at people, but only when I'm not around. My stepson comes over every other weekend and as long as I am around the cat is OK, but if I leave the room she starts to hiss and growl at him. At first I thought they just needed time to get to know each other, but that hasn't help. Then I thought maybe the boy was mistreating the cat, he said he wasn't. And then the other day we had a friend over and the cat was being perfectly friendly, until I left the house and she started hissing and growlling at her. What is going on here?????