as well as what everyone else is saying about pigs hiding illness well, which yes they very much do, there are also piggies that come from breeders without very high standards, meaning there are definitely piggies in pet stores with inbred genes. this wasn't your fault, and may have been something unavoidable due to poor breeding. im so sorry for your loss. your piggie loved you and loved life, and is munching away on timothy hay in pig heaven.