All animals are at risk of things like heart problems, aneurisms, and choking. I lost my parrot recently instantaneously. My husband walked by his cage to get something and saw him happily eating, walked back and he was dead on the floor. Who knows which of those 3 things claimed him but when there's no symptoms and they go from normal to dead very quickly it's usually one of those. One of my competitors in 4h shows had her horse drop dead in the pasture of an aneurism. It still had grass in it's mouth. They had a necropsy done since this was a several thousand dollar animal in what appeared to be perfect health.