Originally Posted by jcat
Sometimes it seems as if pets are even more prone to cancer than people.
Cancer is a degenerative disease. In the Middle Ages, very few people died of cancer; they didn't live long enough. If we conquered every other disease, so that people lived to 150, we would probably all die of cancer, eventually. Some cancers are so common, they might be considered normal. A good example is prostate cancer, which virtually all men will get if they live long enough.