We recently got a new addition to our guinea pig family. Marsie is suppose to be 8weeks but she is very tiny and we assume under weight (244g) she is very active and follows the other two ladies around, she is eating, pooing,peeing and drinking. She has started to wheeze when she squeak's, little bit worried as this has just happened over night, they currently have wood shavings then hay on top for their bedding. Any ideas of what it could be would be great. Thanks