ever since i bought my guinea pigs, one of them, ceviche, had sneezed very often. i kinda just shrugged it off, but four months later, ceviche is still sneezing just as much. i searched up online what this could be, and i have seen people say it is a symptom of a common cold or URI. however, he isn't showing any other symptoms for either illness. i would take to him to a vet, but there are no vets that specialize in treating guinea pigs. should i be concerned or no?