ok this is worrying me. I have a female cat and male cat, the female is older than the male i'm sure but i have no idea by how much b/c she was adopted off the street a few years ago after my male cat's brother passed away. anyways, all of a sudden since yesterday she's been hissing at him whenever she sees him! and i dont get it, i know female cats can be bitches, but this is too much. maybe he was beating her up all day when i was at work, but its wierd, she's never done that crap before and it worries me b/c he might be sick or something. When his brother was dying, he was hissing at him just like that, even though they loved each other before my Boo got sick. So im worried, they were never the best of friends, but her being mean like this is very unusual!