If your cat has been diagnosed as a diabetic you may be wondering if you have done something wrong. Unfortunately some cats are just more likely to develop the disease than others. Male cats are most likely to get diabetes but any cat can be affected. Obese cats are slightly more likely to develop the disease, but there are many obese cats who do not develop diabetes. Some other diseases can cause diabetes to develop and your vet will check to make sure your cat is not suffering from anything else. In a few cases treating the other disease will make the diabetes go away for a while, but it is quite likely to come back again later.