If a diabetic dog is weak, stumbling, collapsed or seizing, treat it as an emergency and contact a veterinarian or emergency clinic right away. Sugar given at home is only a stopgap for a conscious dog that is showing signs of low blood sugar and is not seizing. It can be insufficient for a life-threatening low, so it must never delay the trip to a clinic.
AAHA’s 2026 diabetes guidelines cover this in Section 11 with two separate decision aids: Figure 11.1, “Managing Hypoglycemia in Diabetic Dogs,” for suspected low blood glucose, and Figure 11.2, “Troubleshooting Diabetic Dogs Receiving High Doses of Insulin,” for dogs that stay poorly regulated on high insulin doses. AAHA says the algorithms originated in its 2018 guidelines and were updated for 2026. The page was published August 31, 2026.
Two algorithms for two different problems
The two figures answer different questions. Figure 11.1 asks what to do now about a possible low. Figure 11.2 asks why an insulin-treated dog is not controlled. The table summarizes how they differ.
| Figure | Use it for | Urgency | What the accessible AAHA text shows |
|---|---|---|---|
| Figure 11.1, “Managing Hypoglycemia in Diabetic Dogs” | Suspected acute low blood glucose | Time-critical; use alongside the first-aid steps below | Title and legend terms only; branch thresholds and treatment steps are not shown in the text |
| Figure 11.2, “Troubleshooting Diabetic Dogs Receiving High Doses of Insulin” | Dogs on high insulin doses that remain poorly regulated | Persistent poor control; not a roadside decision | Title and legend terms only; branch thresholds, tests and treatment steps are not shown in the text |
The scope of Figure 11.2 needs a careful read. AAHA’s section description says the algorithms “can assist with managing hypoglycemic patients and troubleshooting patients on insulins other than basal insulin.” The figure title refers to high doses. The accessible text does not reconcile these two phrasings, so check the scope printed on Figure 11.2 before applying it to a particular dog.
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Recognizing a possible low-glucose episode
Weakness, lethargy, stumbling or ataxia, altered responsiveness, collapse and seizures can all be consistent with hypoglycemia. A diabetic dog can also have low glucose without obvious signs, so a home reading and the dog’s appearance have to be interpreted together. Neither one settles the question alone.
The RECOVER Initiative’s 2026 first-aid guideline lists the following as common out-of-hospital risks:
- Insulin administration
- Neonatal life stage
- Insulinoma
- Insulin-like factors from tumors
- Xylitol ingestion in dogs
- Pregnancy or labor
Decide what to do first
Match the dog’s presentation to one row before acting. The first-aid steps in the next section apply only to the symptomatic row.
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| Presentation | What to do | Source |
|---|---|---|
| Low reading on a test strip or CGM, but no signs of illness | Feed the dog and manage it under the veterinarian’s established plan | RECOVER 2026 |
| Conscious and showing signs such as weakness, stumbling or collapse, not seizing | Apply buccal sugar if the caregiver can do so safely, then transport immediately | RECOVER 2026; Merck Animal Health owner information |
| Active seizure | Do not attempt oral treatment; transport immediately | RECOVER 2026 |
| Unconscious | Contact a veterinarian or emergency clinic immediately | Merck Animal Health owner information |
If your veterinarian has given you a written emergency plan for your dog, follow that plan first. Both RECOVER and Merck defer to the dog’s established plan when one exists.
First aid for a conscious, symptomatic dog that is not seizing
- Check safety first. If the dog is not seizing but handling it carries a real risk of bites or injury to you, skip the sugar and go straight to transport.
- Choose a viscous simple carbohydrate. RECOVER names corn syrup and honey. Merck names corn syrup for owners.
- Measure the amount. RECOVER suggests 0.2–10 mL (up to about 2 teaspoons), scaled to the patient’s size, for symptomatic dogs and cats that are at risk. The guidance does not provide a weight-based table for this volume, so smaller dogs get proportionally less.
- Coat the gums, do not pour. Apply the syrup or honey to the buccal mucosa, the inside of the cheek between the upper premolars or molars and the cheek. The goal is to coat the mucosa, not to make the dog swallow a volume. Merck warns against pouring it into the mouth because of aspiration risk.
- Leave for an open veterinary facility now. The sugar must not delay transport. Do not wait to see whether the dog improves before leaving.
- Once the dog can swallow, offer a small amount of food and contact your veterinarian immediately, as Merck advises.
Two uncertainties apply. RECOVER states that the efficacy of buccal viscous simple carbohydrate for symptomatic hypoglycemia is unknown, and that the appropriate amount for a given degree of hypoglycemia is also unknown. It also states that it is uncertain whether mildly affected animals can safely skip clinic evaluation after an apparent response. Treat an apparent recovery as a reason to call the clinic, not as a reason to cancel the visit.
Where the sources differ on the amount
- RECOVER gives a volume: 0.2–10 mL, scaled to size, for dogs and cats in the symptomatic at-risk group described above.
- Merck’s owner information says “a small amount” of corn syrup on the gums and gives no volume.
- Merck’s professional-facing insulin page gives a weight-based oral glucose amount intended for clinicians. It is not reproduced here. Owners should take any dose instructions from their veterinarian.
Why sugar alone is not the treatment
The RECOVER Initiative’s 2026 guideline states the reason plainly:
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“Because evidence suggests that the blood glucose concentration (BG) increase associated with oral or mucosal administration of sugar may not be adequate to resolve life-threatening hypoglycemia, prehospital treatment should not delay transport to a veterinary facility for intravenous dextrose support, which is more effective.”
When a dog stays poorly regulated on insulin
Figure 11.2 is the decision aid for a dog on high insulin doses whose glucose control stays poor. Because the accessible text does not show its branches, read the full figure on AAHA’s page before acting on any step. The page legend defines the following terms: BGC (blood-glucose curve), CGM (continuous glucose monitor), PE (physical examination), CBC (complete blood count) and UA (urinalysis). The text does not show which steps use which terms.
Document the episode before the appointment
- Insulin name, concentration, dose, and the time and technique of each administration
- Whether a dose may have been repeated
- Meal timing and the amount eaten
- Vomiting or changes in appetite
- Activity or exercise in the hours before the episode
- Glucose-monitor readings and the symptoms seen alongside them
- Other medicines the dog takes
- Recent illness or other changes in health
Factors that can change insulin needs
Merck identifies the following as potential contributors to poor regulation:
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- Excessive insulin
- Delayed or missed food
- Changes in diet or the amount fed
- Illness, decreased appetite or vomiting
- Changing insulin needs
- Adrenal, pituitary or thyroid disease
- Liver or kidney disease
- Medication interactions
- Increased activity
Insulin dose changes are made by the veterinarian, not by the owner.
A steady routine makes insulin more predictable
Merck advises keeping diet and feeding times consistent, not changing exercise without consulting the veterinarian, and scheduling regular evaluations.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Reading glucose data without overreacting
AAHA’s 2026 overview states that the main goal is controlling clinical signs. Tight glycemic control is rarely possible with twice-daily intermediate-acting insulin. Brief readings above 300 mg/dL can occur in clinically well-controlled dogs and do not necessarily require additional workup. A single high reading is therefore not proof that the insulin dose needs to go up.
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Continuous glucose monitors
The Merck Veterinary Manual says continuous glucose monitors developed for human diabetes are increasingly practical in veterinary patients. They can provide frequent interstitial readings over several days. Possible benefits include more glucose data, less discomfort for the dog, and identifying highs or lows that were previously missed. These are options to discuss with your veterinarian. They are not a recommendation for a particular device.
When you discuss monitoring, ask your veterinarian:
Quick Recap
- Will the method capture low-glucose episodes, including overnight?
- How many days of readings are needed, and how often are they collected?
- How will the readings be interpreted alongside the dog’s signs?
- Does this particular dog tolerate the sensor?
What these guidelines do not settle
- The sources give thresholds and recommended amounts. They do not provide population statistics on how often hypoglycemia occurs or how often episodes end well.
- The reviewed material does not include a direct comparative trial of glucose-monitoring methods.
- No single owner-administered protocol is shown to suit every dog. The treating veterinarian or emergency clinic should give individualized instructions.
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