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Guinea pigs like most living things can have heart problems and being this cavy was over weight there may have been a Cardio Myopathy which caused a sudden death. Also, Guinea Pigs can not manufacture their own Vitamin C. It is very possible from the sound of what you have written that your Cavy may have had a serious deficiency and died of Scurvy. These are very common illnesses in Cavies especially when they carry the extra weight. I am so sorry for the loss, but without a Necropsy you may never know what the actual cause passing was. I would like to offer this link for help with closure for your Grandson. www.Rainbowbridge.com With sincerest condolences, Joan jav917