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Hypoglycemia in Dogs

What Is Hypoglycemia in Dogs?

Hypoglycemia, commonly known as “low blood sugar,” occurs when there is a decrease in the level of glucose circulating in a dog’s bloodstream. Glucose, derived from dog food, serves as a vital energy source for their cells. Insufficient levels of glucose can lead to symptoms indicating an energy deficiency, particularly affecting the brain’s function.

Hypoglycemia poses significant risks to a dog’s health and requires prompt treatment. If you observe symptoms of hypoglycemia, it is crucial to seek veterinary care immediately.

Symptoms and Types

The symptoms of hypoglycemia in dogs arise from organs not receiving adequate energy. These symptoms may appear suddenly or gradually, varying in intensity.

If you observe any of the following symptoms, it’s essential to promptly contact your veterinarian:

  • Loss of appetite (anorexia)
  • Reduced energy or lethargy
  • Vomiting
  • Disorientation, weakness, or “star-gazing”
  • Tremors or seizures
  • Fainting, loss of consciousness, or coma


The causes of hypoglycemia in dogs can be classified into four primary categories, with diseases often falling into one or more of these groups:

  • Inadequate intake of glucose or glucose-producing molecules:
    • Poor dietary intake of glucose
    • Hypoglycemia in puppies or toy breeds
    • Malnutrition
    • Hypoglycemia in hunting dogs
  • Increased demand for glucose:
    • Insulin overdose in diabetic dogs
    • Xylitol toxicity
    • Insulinoma
    • Cancer
  • Inadequate utilization or inability to produce energy molecules:
    • Portosystemic shunt
    • Chronic renal failure
    • Liver failure
    • Liver cancer
    • Severe infection or sepsis
  • Endocrine system abnormalities causing hormonal imbalances:
    • Addison’s disease (hypoadrenocorticism)
    • Hyperpituitarism


Following a thorough examination and review of your pet’s medical history, your veterinarian will proceed with diagnostic testing. These tests may encompass:

  • Blood glucose test: A quick bedside test focusing on blood sugar levels.
  • Chemistry/complete blood count: A comprehensive blood test examining red and white blood cell counts, glucose levels, electrolytes, and organ function. This test may be conducted in the hospital or sent to a laboratory for analysis.

Additional tests may be warranted based on initial findings, clinical signs, and your pet’s medication history:

  • Bloodwork
  • Bile acids test: Detects liver damage
  • Hormone-level testing: This may involve assessing resting cortisol levels or performing an ACTH stimulation test to investigate Addison’s disease.
  • Insulin/glucose ratio test: Evaluates circulating insulin and glucose levels, potentially indicating pancreatic cancer known as insulinoma.
  • Imaging studies: These may include radiographs/x-rays or abdominal ultrasound to screen for various cancers, liver disease, adrenal gland disorders, or other potential causes.


The treatment approach for hypoglycemia in dogs varies depending on the severity of the condition. For pets displaying mild symptoms, oral liquid glucose may suffice. However, for those with moderate to severe symptoms, hospitalization is typically necessary. Hospital care will involve intravenous (IV) fluid therapy containing dextrose, a sugar compound, to elevate your pet’s blood sugar levels, even if it is not consuming food. Further treatments may be required based on the underlying cause of your pet’s hypoglycemia.

Living and Management

For pets experiencing mild, uncomplicated hypoglycemia, recovery is typically rapid. It’s commonly advised to feed the dog frequent small meals rich in fats, proteins, and complex carbohydrates, particularly for toy breeds and puppies recuperating from hypoglycemia. Monitoring their eating habits is crucial for ensuring a smooth recovery process.

Pets with moderate to severe or complex hypoglycemia might require hospitalization, and the recovery outlook is cautious. Addressing the underlying cause of hypoglycemia is often imperative. In the case of diabetic dogs, your veterinarian might recommend withholding insulin administration temporarily, or they may adjust the insulin dosage once your pet returns home.


Preventing hypoglycemia in dogs largely hinges on addressing the underlying causes. For diabetic dogs, regular glucose monitoring following insulin administration is crucial, whether conducted at home or at the veterinarian’s office. In the case of puppies and toy breeds, maintaining a high-quality diet with small, frequent meals is essential to regulate glucose levels effectively. Pets with underlying medical conditions should be monitored regularly during visits to the veterinarian’s office.

Hypoglycemia in Dogs FAQs

What are four common signs of hypoglycemia in dogs?

The four most prevalent symptoms of hypoglycemia include:

  • Weakness/lethargy
  • Vomiting
  • Seizures
  • Fainting

How long does hypoglycemia persist in a dog?

Hypoglycemia continues until adequate glucose levels are supplied to the organs lacking this essential energy source. The duration of recovery depends on how low the pet’s blood sugar has dropped and the duration of the low levels. Pets with underlying conditions contributing to low blood sugar will also have extended recovery periods.

What occurs if a dog’s blood sugar drops too low?

When a dog’s blood sugar levels plummet, the body lacks the energy necessary for normal functions. Symptoms may manifest rapidly or gradually, depending on the cause, and may include weakness, vomiting, seizures, or fainting.

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