URI/Upper Respiratory Infection Sick pig or hay dust?

My little Kiwi is breathing strange, almost like a crackle. Her wheek is also off in that it is very high pitched, almost like how a human "squeeks" when he/she is losing his/her voice. She eats perfectly fine, poops fine, has no crusty eyes or runny nose. She is not hiding. When she eats she coughs more than usual. I know that she will "choke" every once in a while when eating and have to cough because of it, but she has been doing it more frequently the last couple days. I had to buy cheap hay a few days ago until their good quality hay arrived and it was very small pieces with a lot of dust. Could she just have an irritation in her respiratory tract from the hay or is it most likely a URI? It is Labor Day so I am certain the vet is closed. I'm pretty worried, so please give some input.