This is for a friend, thankfully my girls are doing fine! A friend just lost her 3-ish year old boar today. She just went to clean the cage and found that he had died in his sleep. He hadn't shown any signs of being ill. No respiratory symptoms, no weight loss, no behavior change. The only thing that was 'new' was that he had a bad scratch on his eye last week and was on an antibiotic eye drop for that. She was wondering if he could have gotten an infection due to the eye scratch that could have killed him without him showing signs of being ill. I think it was more apt to be an underlying heart problem or something like that which didn't present with any symptoms. I know she is a very hands on 'mom' to the pigs, and her kids are also good with the pets and very involved, so I'm convinced that if there were symptoms to see, someone would have noticed them. The cage-mate pig appears to be fine, not ill, but obviously subdued as he has lost his friend. They are indoor pigs, it's far too cold where we live for pigs to be outdoors at this time of year, so them temperature has been controlled and there's no chance that he ate anything strange on the lawn. Any ideas for the cause of a sudden pig death?