My Rat Is Wheezing A Tiny Bit, But It's Not Noticeable Unless You Pay Close Attention. Is Something Wrong?

The other day I was just watching my rats, and I heard a faint wheezing sound coming from one of them. It wasn't that loud, but if I was a little farther away from their cage, I wouldn't have noticed. My rat Alfred isn't sneezing a lot, maybe like two or three times a day, which is normal for him, he's acting like he usually does, he seems healthy, his nose and eyes aren't secreting anything red, he's been eating and drinking water normally, it's just when I let him sniff my hand, or he's

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