As I mentioned on another thread, I just recently got a younger cat in my apartment and finished introductions with my formally single cat. Things are getting better over time but every now and then they still get in a wrestling match or a chase that involves my older cat on her back and growling or hissing. But, I checked on her today during one of those incidents and both cats seemed relatively calm and even sniffed my finger in the middle of it before another jump, growl, hiss routine. So, I thought that maybe I've been mistaking these growls and hisses for anger all along and maybe this is just her way of playing with another cat? I am being completely far-fetched here?