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Hello, I am very sorry to hear of your loss. I know how devastating a sudden death is when you believe the dog is perfectly healthy.
Without a necropsy being done there is no way to know for sure what happened to your baby. Absent from some type of poisinging, this breed is prone to a couple of heart defects and they are not always picked up on a vet visit. This is the only thing that I can see in this breed that would cause a sudden death. Your baby may have had a virus that put a strain on the heart itself.
I am sorry that this seems so vague but I am sure you understand that this is not something that has specific symptoms other than a virus.
I know how heart broken you are as I have been there myself. There is a site I would like to direct you to which may help get you through these feelings as we were all there for the same reason. www.petloss.com
Again I am very, very sorry for your loss.
not that they would be symptoms of a heart problem but if it were a virus it could put strain on the heart. He may have felt weakened