Unfortunately, obesity in domestic cats has been on the rise. Obesity poses serious heath threats to your cat, including contributing to osteoarthritis, cardiovascular disorders, and diabetes. Just like with us humans, if cats don’t get enough exercise or don’t have the correct diet, they can accumulate fat in their bodies. Not all big cats are necessarily obese, of course. Technically, obesity is determined by the proportion of fat relative to what should be normal for your cat’s size. If your cat has 20% more body weight than is normal for a cat of his or her size, you cat is technically obese.