Hello, My rat is 10 months now. He makes a funny clicking/squeaky noise when breathing, like he's got a blocked nose, mostly when he gets over excited during play time; just this one time he was making the same noise when he was sleeping. I know it's from his nose as the noise continues when he's eating, it's not bruxing either. I had a listen to his chest and there's no wheezing or laboured breathing. Apart from that he's behaving and eating/drinking normally. Is there something I should be worried about? The other rat, his brother, is fine. Thank you very much for your time.

