Since I've had Scout for two months now I have finally learned the difference between fighting and rough play. Scout and Jazz wrestle around and play, very rough, up to 10-12 times a day but ever so often Jazz is not in the mood and it turns into a fight with usually Scout getting the harder end and running off. Jazz, who had never hissed before Scout, has learned to do this pathetic scratchy hiss when she has had enough. If Scout doesn't get the message then Jazz usually whacks her extremely hard with claws out. I try to intervene when I hear the hiss so Scout won't get hurt but she did get scratched on the top of her head about a month ago.

Their play is very similar to fighting too with their ears down, eyes dilated and tails flicking but they never make that little growl or cry.

If you don't have a water bottle handy try throwing a small light weight pillow or towel at them to break it up. I found that works great when Ripley is having one of his rage fits and attacks me. (that's another very long story).