Diabetic dog that will not eat: what to do with insulin
10-year-old neutered male Miniature Schnauzer, a stable diabetic on lente insulin every 12 h. The owner calls in the morning: today he will not eat, although he is active and has not vomited.
What do you advise the owner?
chevron_right Show answer and explanation
A. Give the full dose anyway, because skipping a dose causes ketoacidosis
A missed or reduced dose does not cause ketoacidosis in a stable dog. A full dose without food, however, can cause hypoglycaemia.
B. Give a double dose in the evening to make up for the morning one
A missed dose is never made up: doubling the dose is a classic cause of severe hypoglycaemia.
C. Do not give the full dose: if he eats nothing, skip it; if he eats part, give a reduced dose (half, for example), and get in touch if he does not eat at the next meal or develops vomiting or lethargy
Correct. This is the safe home protocol: it avoids hypoglycaemia, and persistent anorexia may indicate a concurrent illness (pancreatitis, ketosis) that requires examination.
D. Give honey or sugar by mouth and then the full dose
Sugar is absorbed quickly and does not cover the hours of insulin action; it also destabilises glucose control. It is only used to treat hypoglycaemia.
lightbulb Key takeaway
Explain the rule "no food, no full dose" to the owner from day one, and that a doubtful dose must never be repeated or doubled. A diabetic dog that misses more than one meal needs a check-up: look for pancreatitis and measure ketones.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.