Diabetic Emergencies: Recognising and Responding to Hypo- and Hyperglycaemia

Managing diabetes in pets is largely about maintaining blood glucose within a safe range — not too high and not too low. When this balance tips dramatically in either direction, a diabetic emergency occurs. Understanding the two types of emergency — hypoglycaemia (dangerously low blood sugar) and hyperglycaemia leading to diabetic ketoacidosis (DKA) — is essential knowledge for every pet owner managing a diabetic animal.

"The most dangerous moment for a diabetic pet isn't the day they're diagnosed — it's the day something disrupts their routine. A missed meal, a wrong dose, or an illness can trigger a crisis in hours. Every diabetic pet owner needs an emergency plan before they need it." — Dr. Sarah Chen, DVM

Hypoglycaemia occurs when blood glucose drops too low, typically below 3.3 mmol/L (60 mg/dL). This usually results from too much insulin relative to the amount of food consumed — whether because of an insulin overdose, a missed or vomited meal after insulin was given, or unexpectedly increased exercise that burned through available glucose. Hypoglycaemia develops rapidly and can become life-threatening within minutes, making it the more immediately dangerous of the two emergencies.

Hyperglycaemia and DKA develop when there is insufficient insulin to move glucose into cells. Blood sugar climbs to dangerous levels (often above 16.7 mmol/L or 300 mg/dL), and the body begins breaking down fat for energy, producing toxic byproducts called ketones. This state — diabetic ketoacidosis — develops over hours to days and is equally life-threatening. As our comprehensive guide on diabetes management in pets explains, consistent routine is the foundation of prevention for both emergencies.

Hypoglycaemia is the emergency that diabetic pet owners fear most — and rightly so. It can progress from early warning signs to seizures and unconsciousness within minutes if not addressed. The brain depends almost entirely on glucose for energy, which is why low blood sugar affects neurological function so rapidly and dramatically.

Early warning signs (mild hypoglycaemia): The first symptoms are often subtle: unusual restlessness or anxiety, mild trembling or shivering, hunger (your pet may beg for food urgently), slight unsteadiness or wobbliness when walking, and dilated pupils. Cats may vocalise more than usual or hide. Dogs may pace or whine. At this stage, blood glucose is typically between 2.8 and 3.3 mmol/L (50–60 mg/dL), and the situation is still easily correctable.

Moderate hypoglycaemia: As blood sugar continues dropping, symptoms intensify: pronounced muscle trembling and weakness, staggering or drunken gait (ataxia), disorientation and confusion, drooling, pale gums, and a glassy-eyed or vacant stare. Your pet may not respond normally to their name or commands. Immediate intervention is critical at this point.

Severe hypoglycaemia: If untreated, severe hypoglycaemia leads to seizures, loss of consciousness, and potentially death. Seizures may range from focal twitching to full grand mal convulsions. This is a true veterinary emergency.

Emergency response — what to do RIGHT NOW: If your pet is still conscious and able to swallow, immediately rub a tablespoon of honey, golden syrup, or sugar water (one tablespoon of sugar dissolved in two tablespoons of warm water) directly onto the gums and under the tongue. The oral mucosa absorbs sugar quickly, even without swallowing. Do NOT attempt to pour liquid into the mouth of a seizing or unconscious pet — aspiration into the lungs is a serious risk. For a seizing pet, apply honey to the gums with your finger (taking care to avoid being bitten), keep them safe from falling, and rush to the nearest emergency vet immediately. Even if your pet recovers quickly after sugar supplementation, contact your vet — the insulin dose or feeding schedule likely needs adjustment.

If hypoglycaemia is a sudden plunge, diabetic ketoacidosis is a slow-burning crisis that builds over hours to days. DKA occurs when the body has severely insufficient insulin — whether from undiagnosed diabetes, inadequate insulin dosing, missed injections, or a concurrent illness that increases insulin resistance. Without enough insulin to transport glucose into cells, the body turns to fat as an emergency fuel source, producing ketone bodies (acetone, acetoacetate, and beta-hydroxybutyrate) as byproducts. These ketones accumulate in the blood, causing it to become dangerously acidic.

How DKA develops: The process typically follows a pattern. Blood glucose rises progressively because insulin is insufficient. The kidneys attempt to flush excess glucose through urine, causing massive water loss and dehydration. Fat breakdown accelerates, flooding the bloodstream with ketones. The blood becomes acidic (acidosis), disrupting cellular function throughout the body. Electrolyte imbalances develop as minerals are lost in excessive urination. Without intervention, multi-organ failure follows.

Symptoms of DKA: Unlike the rapid onset of hypoglycaemia, DKA symptoms build gradually: markedly increased thirst and urination (the earliest signs), progressive loss of appetite, worsening lethargy and weakness over days, persistent vomiting (often the sign that prompts the vet visit), fruity or acetone-like breath odour (from exhaled ketones — a hallmark sign), rapid or laboured breathing (the body's attempt to compensate for acidosis), severe dehydration (tacky gums, sunken eyes, skin that tents when pinched), and eventually collapse and coma.

DKA requires emergency veterinary care: Unlike hypoglycaemia, DKA cannot be managed at home. Treatment requires hospitalisation with aggressive intravenous fluid therapy to correct dehydration and electrolyte imbalances, carefully titrated intravenous insulin (short-acting regular insulin, not the long-acting type used at home) to gradually bring blood glucose down, potassium and phosphorus supplementation (insulin shifts potassium into cells, which can cause dangerous drops), frequent monitoring of blood glucose, electrolytes, and blood gas, and treatment of any underlying trigger (infection, pancreatitis, etc.). DKA treatment typically requires two to five days of intensive care. Mortality rates range from 20 to 40 per cent even with treatment, making prevention critically important.

Understanding the triggers for diabetic emergencies is the first step toward preventing them. While some triggers are within your control, others require vigilance and quick recognition.

Common triggers for hypoglycaemia: Insulin overdose — the most preventable cause, whether from drawing up too much insulin, accidentally giving two doses (when two family members each give insulin without communicating), or using a different concentration of insulin without adjusting the dose. Missed or vomited meals — if your pet receives insulin but doesn't eat, or vomits shortly after eating, there's nothing to counter the glucose-lowering effect. Excessive exercise — unusual physical activity burns glucose rapidly, and a diabetic pet on insulin may not be able to compensate. Insulin overlap — some insulin types have prolonged action curves, and if doses are given too close together, effects can stack.

Common triggers for DKA: Missed insulin injections — even one or two missed doses can start the cascade in a poorly regulated diabetic. Concurrent illness — infections (particularly urinary tract infections), pancreatitis, and dental disease increase insulin resistance, meaning the usual dose is no longer sufficient. This is why diabetic pets who become ill for any reason need immediate veterinary attention. Stress — surgery, boarding, or significant household changes can raise cortisol and other counter-regulatory hormones that oppose insulin. Improper insulin storage — insulin that has been frozen, overheated, expired, or shaken vigorously may lose potency without visible changes to the solution. New medications — corticosteroids and certain other drugs can dramatically increase insulin resistance.

Recognising the early signs that something is wrong with your diabetic pet is far more valuable than knowing how to treat a full-blown crisis. When in doubt, check blood glucose and call your vet immediately.

The vast majority of diabetic emergencies are preventable with consistent management, good communication, and attention to early warning signs. Building robust habits around your pet's diabetic care dramatically reduces the risk of a crisis.

Maintain a consistent routine: Feed the same food at the same times every day, and give insulin at the same times relative to meals. Most vets recommend feeding immediately before or with the insulin injection, so you can confirm your pet has eaten before the insulin goes in. If your pet refuses food or vomits, do NOT give the full insulin dose — contact your vet for guidance on a reduced dose or skip.

Master your insulin technique: Use the correct syringe type for your insulin concentration (U-40 syringes for U-40 insulin, U-100 for U-100). Store insulin in the refrigerator (not the door, where temperature fluctuates), never freeze, and gently roll (don't shake) cloudy insulin to mix. Mark vials with the date opened — most insulin types should be discarded after 28–42 days, even if solution remains.

Communicate within the household: Establish a clear system so only one person gives insulin at each scheduled time. A simple checklist on the refrigerator — date, time, dose, initials — prevents the dangerous "I thought you gave it" scenario that leads to double-dosing or missed doses.

Monitor at home: Regular home blood glucose monitoring (using a pet glucometer with ear or lip prick) gives you invaluable real-time data. At minimum, know what normal blood glucose looks like for your pet — your vet will provide target ranges — so you can spot trends before they become emergencies.

Plan for disruptions: Holidays, travel, boarding, and schedule changes are high-risk periods. As outlined in pet first-aid essentials, preparation is everything. Brief anyone caring for your pet thoroughly on the insulin routine, emergency signs, and what to do. Provide written instructions, your vet's emergency number, and the location of all supplies.

Every household with a diabetic pet should have a dedicated emergency kit assembled, accessible, and known to all family members. When a crisis strikes, seconds matter — fumbling through drawers looking for supplies isn't an option. Here's what your kit should contain and why each item matters.

Glucose syrup or honey: This is your most critical item for hypoglycaemia. Keep a small squeeze bottle of golden syrup, corn syrup, or honey in the kit at all times. These thick, sugar-rich liquids can be rubbed directly onto gums for rapid absorption. Replace them every six months to ensure freshness. Sugar packets or glucose tablets (crushed and dissolved in a small amount of water) are acceptable alternatives.

Pet glucometer and test strips: A glucometer designed for pets (such as the AlphaTRAK) gives accurate readings from a tiny blood sample taken from the ear margin or lip. Keep the meter, lancets, and a fresh container of test strips in the kit. Knowing your pet's actual blood glucose level during a suspected emergency guides your response — is this hypo or hyper? The answer determines everything.

Ketone test strips: Urine ketone strips (available from pharmacies) can detect ketones by testing a urine sample — useful if you suspect DKA is developing. Some newer pet glucometers also measure blood ketones directly. A positive ketone reading in a diabetic pet warrants immediate veterinary contact.

Emergency contact information: Print and laminate a card with your regular vet's number, the nearest 24-hour emergency veterinary hospital (with address and directions), and any pet poison helpline numbers. Include your pet's current insulin type, dose, and schedule on this card so any caregiver or emergency vet has critical information at a glance.

Insulin and supplies backup: Keep a backup insulin vial (stored correctly in the fridge, within expiry), extra syringes, and a sharps container in or near the kit. Running out of insulin is a fully preventable trigger for DKA.

Written emergency protocol: A step-by-step laminated card covering: what to do for suspected hypoglycaemia (rub sugar on gums, call vet), what to do for suspected DKA (do NOT give insulin at home, go to emergency vet immediately), and when to call the vet versus when to drive straight to the emergency hospital. This card should be simple enough that a pet sitter or family member with no medical background can follow it under stress.