Hi, I'm recently a new piggie owner, my three girls are 8 months old, I've just noticed one of my pigs started making a strange noise whilst breathing like a slight wheezing noise, I've youtube some noises and non of them sound similar to the one she is doing it's also not constant and she is doing normal things such as eating drinking sleeping and making other piggie noises, she's always been a very vocal piggie so was just wondering wether it was a different sound I haven't heard them do yet, thank you