There are actually two different kinds of diabetes (mellitus and insipidus), but the more commonly diagnosed form is diabetes mellitus. This is a disease in which the pancreas does not produce enough insulin. Insulin is a hormone that allows the body to utilize it's glucose (sugar) appropriately. Without enough insulin, the blood sugar rises to levels that "overload" the body resulting in increased appetite, urinating, and drinking. If left untreated, diabetes mellitus can result in changes to the liver, urinary tract infections, cataracts, and even an emergent condition called Diabetic Ketoacidosis, which can be fatal if not treated immediately.
Diabetes is easily detected on routine screening bloodwork and urinalysis, which is why these routine tests are so crucial to maintaining health in your pet.
Please let the staff at FAH know if you notice any of the following in your pet: increased urination, increased thirst, excessive apetite, or ocular changes.