Lost a LGD...questions

[Teckelhut]

I have known people and animals that's heart sounded strong up until they just dropped dead. My Uncle is a classic example. And horses in competition that just drop dead with a rider on them. I sure other's have heard of people who had a heart attack that had just been to the Doc and pronounced in good health.

ANY dog can have a heart attack but it seems like the bigger ones are more prone to it.