I'm not sure about this, I just noticed it this morning when I was giving my guinea pig her daily veggies. When she breathes it's like a quiet ticking-like sound, or really soft squeaking. Maybe like when your nose is kind of stuffed up, and you're sniffling-except quieter. She doesn't have a runny nose, her nose looks pretty clean, but I shouldn't take any chances. I've told my dad she might be sick, but the last time I thought she was sick and we took her to a vet ASAP (on my dad's work day-which he was pretty mad about because he had to cancel a meeting), it turned out she wasn't sick and we wasted $50... Now he's doubtful that she's really sick and I don't want to get him mad again cause I wasted his time and because I wasted money over something he thought was not needed. I need some opinions, to see if she's very sick and how to convince my dad today (since the vet is not open today and I'm very busy next week with school).