Is it possible for a kitten or cat to not know how to hiss? he's around 10 months old lastnight and the other night i was fighting with him to clip his back claws and he would release air like a human sigh, but no hiss. Sometimes ive even tried to make him hiss to see if he could, nothing! He was born with a viral problem so he's usually stuffy and his meows dont come out completely. But my question is, is it possible to a cat to never hiss?