Understanding Hypoglycemia in Dogs

Hypoglycemia (AKA low blood sugar) happens when your dog’s glucose levels drop too low for their brain and body to function normally. It can come on suddenly or build gradually, and in serious cases it can cause seizures, collapse, or worse. If your dog just showed signs that brought you here, the most important thing to know is this: hypoglycemia is treatable, but it almost always points to an underlying cause that needs to be identified.

What is hypoglycemia in dogs?

Hypoglycemia is what happens when your dog’s blood glucose drops below the level their body needs to function. Glucose is the brain’s primary energy source, so when levels fall too low, things can go wrong quickly, from mild confusion and weakness to seizures and loss of consciousness.

It’s worth knowing that hypoglycemia is usually a sign of something else going on, not a condition on its own. That’s why identifying the root cause matters just as much as treating the immediate episode. The good news is that when it’s caught and treated promptly, many dogs recover well.

Symptoms of hypoglycemia in dogs

Symptoms can come on suddenly or build slowly, and they can look different depending on the cause and severity. Here’s what to watch for:

• Shaking, trembling, or muscle tremors
• Disorientation or confusion (your dog seems “out of it” or unusually spacy)
• Wobbly movements or loss of balance
• Lethargy or unusual tiredness
• Glassy eyes
• Vomiting
• Seizures
• Fainting or loss of consciousness

If your dog is having a seizure, has collapsed, or is unresponsive, this is a medical emergency. Get to a vet immediately. If they’re conscious and able to swallow, you can rub a small amount of corn syrup or honey on their gums to help temporarily stabilize their blood sugar on the way, but this is a bridge, not a fix. Vet care comes next no matter what.

What causes hypoglycemia in dogs?

Hypoglycemia can have several different causes, which is part of why diagnosis requires more than just a blood sugar test. Here are the most common:

• Puppy hypoglycemia: Puppies under three months old, especially toy breeds, haven’t fully developed the ability to regulate blood glucose. Stress, poor nutrition, cold environments, or intestinal parasites can all trigger a dangerous drop.
• Diabetic dogs: Too much insulin, whether from an accidental overdose or a missed meal, can send blood sugar crashing.
• Insulinoma: A pancreatic tumor that produces excess insulin. It most commonly affects middle-aged to older dogs, with a median diagnosis age of around nine to ten years, and is more often seen in medium to large breeds.
• Xylitol poisoning: This sugar substitute, found in sugar-free gum, candy, peanut butter, baked goods, toothpaste, and some supplements, triggers a rapid and powerful insulin release in dogs that can cause profound hypoglycemia within 30 to 60 minutes of ingestion. It can also cause serious liver damage at higher doses.
• Hunting dog hypoglycemia: Prolonged, intense exercise can deplete glucose reserves in working or highly active dogs.
• Liver disease: A compromised liver can’t store or release glucose properly, which makes blood sugar levels hard to regulate.
• Other conditions: Addison’s disease (a hormonal disorder), sepsis, and certain other tumors can also cause hypoglycemia.

How is hypoglycemia diagnosed?

Diagnosing hypoglycemia starts with a blood glucose test to confirm that levels are low. But because hypoglycemia is usually a secondary condition, your vet will also want to find out why it happened. Depending on your dog’s history and symptoms, that might involve:

• A comprehensive blood panel to assess organ function and look for underlying disease
• An abdominal ultrasound to check for tumors, particularly in the pancreas or liver
• Insulin-to-glucose ratio testing to assess whether the body is producing too much insulin
• Chest X-rays if cancer spread is a concern

The diagnostic process can feel like a lot, especially when you’re already worried. It helps to ask your vet to walk you through each test and what they’re looking for. Understanding the reasoning makes it easier to follow along.

Treatment for hypoglycemia in dogs

Treatment depends on what’s causing the hypoglycemia and how severe it is.

• Mild cases: If your dog is conscious and stable, your vet may recommend feeding small, frequent meals to help keep blood sugar steady. There’s no one specific “hypoglycemia diet,” but consistent feeding schedules and avoiding long gaps between meals can help, particularly in puppies and at-risk dogs.
• Moderate to severe cases: Your dog will likely need to be admitted to the hospital for intravenous dextrose, a concentrated sugar solution, to bring glucose levels back up quickly and safely.
• Diabetic dogs: Your vet may adjust insulin dosing or feeding schedules to reduce the risk of future episodes.
• Insulinoma: Surgery to remove the tumor is usually the preferred treatment. Frequent feeding and medications may help manage symptoms in cases where surgery isn’t an option.
• Xylitol poisoning: Immediate veterinary intervention is critical. Treatment focuses on stabilizing blood sugar with IV dextrose and monitoring closely for liver damage, which can develop within 12 to 48 hours of ingestion.

In all cases, treating the underlying cause is what prevents it from happening again. Your vet will map out a plan based on what they find.

Is hypoglycemia in dogs covered by insurance?

A hypoglycemic episode can mean emergency care, diagnostics, hospitalization, and follow-up treatment, and those costs add up fast. If your dog develops hypoglycemia after enrolling in a Lemonade Pet policy, those costs may be covered, as long as the underlying condition isn’t pre-existing. That includes diagnostics, emergency hospital stays, and treatment for underlying causes like insulinoma or xylitol poisoning.

And with add-ons like Lemonade’s Visit Fee, even the exam fees that come with follow-up monitoring can be covered. If you’re not yet insured, it’s worth getting a quote before any symptoms appear, as coverage only applies to conditions that develop after your policy is in place, and your waiting periods pass.

Before we go

Hypoglycemia can feel alarming, especially the first time it happens. But understanding what it is and what to do next puts you in a much better position to help your dog. Watch for the early signs, keep regular feeding schedules for at-risk dogs, and don’t wait on vet care if things escalate. The faster it’s treated, the better the outcome. And having a plan in place, including the right insurance coverage, means one less thing to worry about when it counts.

Frequently Asked Questions

A few quick words, because we <3 our lawyers: This post is general in nature, and any statement in it doesn’t alter the terms, conditions, exclusions, or limitations of the policies issued, which differ according to your state of residence. You’re encouraged to discuss your specific circumstances with your own professional advisors. The purpose of this post is merely to provide you with info and insights you can use to make such discussions more productive! Naturally, all comments by, or references to, third parties represent their own views, and Lemonade assumes no responsibility for them. Coverage may not be available in all states. Please note that statements about coverages, policy management, claims processes, Giveback, and customer support apply to policies underwritten by Lemonade Insurance Company or Metromile Insurance Company, a Lemonade company, sold by Lemonade Insurance Agency, LLC.  The statements do not apply to policies underwritten by other carriers.