Please help me, my guinea pig Blaze has started to breathe very loudly with a slight whistle to it. I can sometimes hear it, like if I pick him up, but if he's in the cage he is mostly silent. He is eating and drinking, and I have noticed no discharge from the nose and mouth. He is bedded on fleece, and has a roommate. He did have a bath yesterday, but it was to get ready for show which is tomorrow. I dried him off very well, and earlier today I didn't notice the breathing. But when I picked him up to clean the cage, he started breathing really hard and having a light whistle to it. What's wrong with my baby?