My 5 y/o cat just came home from the animal hospital yesterday after spending nearly a week there with liver problems. She appears to be doing great, eating and acting like her old self...BUT.....our 8 month old male kitten is being aggressive towards her. I'm not sure if maybe she smells like other animals, or what his problem is. So we have our older cat separated from our two kittens (a sister and brother from the same litter).