I have 2 kittens, Pixie and Boo, that came from the same litter and have never been apart. Over the last couple months we have watched the chase each other around and beat the crap out of each other, but when pplay time was over they would give each other a bath and sleep together. About a week ago they were playing as usualunder the couch, next thing you know there was a big hiss and boo took off running up the stairs, now she wont come back down and everytime she sees pixi she hisses and takes off running??.Boo has no problem with us or our dog only Pixie, I dont know what happened but i would love to have my cuddly kitties back. Will Boo ever go back to the way she was with Pixie?