Diabetes in dogs is caused by obesity. When your pet dog is obese, their pancreas have to work harder to produce insulin, which can lead to diabetes. Symptoms of diabetes in dogs include increased thirst, urination, and appetite. If your dog is showing any of these symptoms, take them to the vet for a check-up. Diabetes mellitus is a serious condition that can be difficult to manage. Unfortunately, some dogs are more likely to develop the disease than others. Research shows that obese dogs are at a higher risk. However, with the right treatment plan, your pet can live a healthy life. In some obese dogs, weight loss may control their diabetes for a while.