All canine and feline patients, with the exception of pets suffering from diabetes mellitus that are presented as an emergency, should be starved before the appointment if possible. However, the appointment should not be delayed even if this is not possible. For patients that are presented for the first time it is recommended that they are starved, again with the exception of patients suffering from diabetes mellitus. This will allow certain investigations to be carried out on the same day as the consultation. Owners of patients that present for routine re-examinations will usually be advised as to whether or not their pet needs to be starved for future consultations.