Silly question, but how obvious should normal breathing be in a kitten. I have noticed that when Rajah breathes, whether at rest or even after playing, his sides move up and down quite fast. Sometimes when he has been playing really hard, eg running fast when my daughter plays chase with him, he pants with his mouth open. He doesn't appear to be discernably unwell, nor does he seem to tire quickly or easily, and is eating normally. I am just a little concerned because I have owned rats in the past and when they get lung problems their breathing becomes very obvious and their sides move in and out really fast.