Chronic pancreatitis can kill the cells in the pancreas that make insulin, thus leading to diabetes (for which obesity is a risk factor).
Once a dog has had an attack of pancreatitis, there’s no option but to feed a diet that is very low in fat. In fact, before dogs can even tolerate this, they may require intravenous fluids and antibiotics.
The veterinarian will give strict instructions to provide only water in small amounts once the dog is home. The reason for this is simple: the inflamed pancreas cannot tolerate any stimulus. Hydration is critical. A well-hydrated dog experiences better blood flow to the pancreas and faster healing. Dehydration slows healing. Read more Are Raw or Cooked Diets Best for Dogs With Pancreatitis?