Insulin may not be lowering your dog's blood sugar due to issues with the insulin itself (spoiled/expired), incorrect dosing, dietary issues, or underlying health conditions causing resistance, such as untreated infections, Cushing’s disease, or pancreatitis. A common, critical cause is the Somogyi rebound effect, where too much insulin causes a sharp drop in blood sugar, prompting the body to release hormones that cause a severe spike in blood sugar, appearing as though the insulin isn't working.

What if my dog's blood sugar is still high after insulin?

Persistent high blood sugar after insulin and feeding suggests possible insulin resistance or dosing issues. Symptoms include elevated glucose readings and lethargy. Treatment involves adjusting insulin type or dose under veterinary guidance, consistent feeding schedules, and monitoring glucose levels frequently.

Why is my dog's insulin not working?

Pancreatic disease can interfere with response to insulin. Pancreatitis is a common co-morbidity in diabetic dogs (35%) and cats (50%) that can result in IR and variability in insulin requirements with variation in the level of pancreatic inflammation in chronic pancreatitis.

What happens if blood sugar doesn't go down with insulin?

If your cells become too resistant to insulin, it leads to elevated blood glucose levels (hyperglycemia). Over time, hyperglycemia can lead to prediabetes and Type 2 diabetes.

How long does it take for insulin to lower blood sugar in dogs?

This medication should take effect within 1 to 2 hours; however, effects may not be noted outwardly, so laboratory tests must be done to evaluate the medication's effectiveness.

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How to tell if insulin is working in dogs?

Tracking results of glucose in the blood is an easy way to know if your insulin dose is correct. Urine glucose monitoring can also help but is not as precise. To create a glucose curve, blood glucose levels are checked about every two hours over a 12-hour period, if possible.

How to tell if insulin isn't working?

Oral Glucose Tolerance Test (OGTT: 140–199 mg/dL after 2 hours): For this test, you drink a sweet liquid and your blood sugar is checked 2 hours later. This test shows how well your body handles a sugar load. If your sugar stays too high after 2 hours, it means your insulin isn't working properly.

What are the warning signs of diabetic ketoacidosis?

Signs and symptoms

• Fast, deep breathing.
• Dry skin and mouth.
• Flushed face.
• Fruity-smelling breath.
• Headache.
• Muscle stiffness or aches.
• Being very tired.
• Nausea and vomiting.

Why is blood sugar high even after taking insulin?

High blood sugar after insulin often means your insulin dose isn't quite right for your carbs/activity, you have insulin resistance, injection issues (site, air bubbles, old insulin), stress, illness, or timing errors (Dawn Phenomenon, not enough basal), requiring a review with your doctor. 

When to worry about insulin resistance in dogs?

Insulin resistance should be suspected if control of glycemia is poor despite an insulin dosage in excess of 1.5 U/kg, when excessive amounts of insulin (i.e., insulin dosage > 1.5 U/kg) are necessary to maintain the blood glucose concentration below 300 mg/dL, or when control of glycemia is erratic and insulin ...

How do I get my dog's blood sugar down?

To lower a dog's blood sugar quickly, immediate veterinary care is essential. Administering insulin as prescribed by a vet is the primary treatment.

Why is insulin not helping my diabetic dog?

If ineffective, consider insulin underdose, overdose causing rebound hyperglycemia or Somogyi response, or insulin resistance. It is also important to review the animal's history and physical examination findings to help prioritize possible causes of poor diabetic control.

What is a dangerously high blood sugar for a dog?

The normal level of glucose in the blood is 80-120 mg/dl (4.4-6.6 mmol/L). It may rise to 250-300 mg/dl (13.6-16.5 mmol/L) following a large or high-calorie meal. However, diabetes is the only common disease that will cause the blood glucose level to rise above 400 mg/dl (22 mmol/L).

How quickly does diabetic ketoacidosis progress?

DKA usually develops slowly. But when vomiting occurs, this life-threatening condition can develop in a few hours. Early symptoms include the following: Thirst or a very dry mouth.

What if insulin is not bringing down sugar?

If your insulin has stopped working, you may have developed insulin resistance over time. A condition that causes the body's cells to build up a tolerance to insulin, making it less effective so that it can no longer regulate blood sugar levels sufficiently.

Can insulin go bad and not work?

Even insulin that is “in date” can spoil if it's not stored correctly. Expired or spoiled insulin begins to break down and doesn't work as well to lower your blood glucose (sugar) levels. Using expired or spoiled insulin can cause: Higher than normal blood glucose levels.

What is the two finger trick for diabetes?

According to its proponents, you use the pinch method by holding the thumb and index finger of one hand just above the wrist of the other hand and then exerting a little bit of pressure on the wrist. Doing this will supposedly cause the release of insulin and break down glucose.

Can I give my dog insulin earlier than 12 hours?

Most diabetic dogs require insulin injections twice daily. They should receive injections as close to 12 hours apart as possible, and never less than 10 or more than 13 hours apart.

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