Animals can and do get many diseases and syndromes, "wierd" or not. They can't tell us thier symptoms so we don't know hen they do get sick half the time and also what they have. Humans seem to get more diseases because we can treat so many of them that others take their place. For example, hundreds of years ago, so many people died from diseases like the plague, smallpox, influenza, and measles, for starters, that diseases like cancer, diabetes, and heart disease didn't have a chance to slowly harm or kill the sufferers and people lived a lot shorter lives. As with animals, they don't live long enough to develop many genetic and/ or rare diseases, and we don't research them enough to know about them. Many ailments we humans suffer from would not be known if we couldn't describe the symptoms and undergo high-tech diagnostics and treatments.