One of the first symptoms noticed in a newly diabetic pet is a sudden loss of weight, usually despite increased hunger and food intake. This happens because with a shortage of insulin, the animal can no longer receive nourishment at the cellular level and will use both muscle and fat as energy sources. Image:Jock-charms-ladies.jpg Untreated diabetics, or poorly-treated ones, may continue to lose weight until serious complications ensue. Complications can include dehydration and/or ketoacidosis, either of which can be deadly within 48 hours.