Bear in mind that just about any sudden death syndrome that humans can have, so can animals. They get heart attacks, embolisms, strokes, organ failures, you name it. It is certainly disappointing, often devastating when you wonder if you did something wrong to cause it, but it happens nonetheless. There was probably nothing you could have foresee nor done to prevent it.
Just don't let it spoil your appreciation of the hobby. We all get bad days sometimes.
|