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What is Hypothyroidism in Labrador Retrievers

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Labrador Retriever hypothyroidism

If you’re a proud owner of a Labrador Retriever, understanding the potential health risks for your beloved pet is crucial. One health condition that can affect our four-legged friends is hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone, resulting in a slow metabolism. 

Hypothyroidism signs in dogs can be subtle and easily overlooked. Knowing what to look for can help you catch the problem early.

While hypothyroidism may sound daunting, it’s a manageable condition with the right veterinary care. Through a simple blood test, your vet can diagnose hypothyroidism and start the necessary treatment, usually involving synthetic thyroid hormones. 

This article will guide you through everything you need to know about hypothyroidism in Labrador Retrievers. It will cover diagnosis and treatment causes and signs. So, let’s delve deeper into keeping our furry friends healthy and happy.

How Do Labradors Get Hypothyroidism?

Labrador Retrievers, like many dog breeds, can be susceptible to hypothyroidism, a common endocrine disorder in dogs. This condition arises when the thyroid gland doesn’t generate enough thyroid hormone, a crucial element that circulates in the blood and controls metabolism.

Hypothyroidism in dogs can result from two primary causes: lymphocytic thyroiditis or idiopathic thyroid gland atrophy.

Lymphocytic thyroiditis is the leading cause of hypothyroidism and is often a heritable trait, suggesting genetics plays a pivotal role. It’s an immune-mediated disease, where the immune system mistakenly identifies the thyroid as abnormal or foreign, attacking and destroying the thyroid gland.

On the other hand, idiopathic thyroid gland atrophy occurs when thyroid tissue is replaced by fat. The reason remains unclear.

Symptoms of Hypothyroidism in Labrador Retrievers

Symptoms of hypothyroidism in Labradors

Hypothyroidism is frequently diagnosed in Labrador Retrievers. According to a comprehensive study, the hospital prevalence of hypothyroidism stands at 0.174 percent, with Labrador Retrievers showing the highest prevalence rate. Despite not being widespread, hypothyroidism can lead to significant health issues, such as seizures, heart and blood vessel complications, and infertility.

The most prominent signs include hair loss, weight gain, lethargy, a dull coat, and intolerance to colds. These symptoms might seem general or vague, but in combination, they hint at a thyroid problem or hypothyroidism.

Additional Signs of Hypothyroidism in Labrador Retrievers

Beyond the common symptoms, hypothyroidism can also present some other clinical signs. You might observe:

  • Excessive shedding
  • Dry and dull hair, with a very thin to nearly bald hair coat
  • Increased dark pigmentation in the skin
  • Behavioral changes such as depression or increased irritability
  • A slowed heart rate

Hypothyroidism may cause neurologic dysfunction. This could include symptoms like tetraparesis (partial paralysis), central and peripheral vestibular signs (balance issues), and facial paralysis. These symptoms of thyroid disease may be challenging to spot but are significant indicators of the condition’s severity.

If you notice any combination of these symptoms in your Labrador Retriever, it’s crucial to consult a veterinarian.

Risk Factors for Hypothyroidism in Labrador Retrievers

Several factors can increase the risk of a Labrador Retriever developing hypothyroidism. Being aware of these risk factors can help owners monitor for symptoms of hypothyroidism in dogs and seek timely veterinary care.


Genetics often plays a significant role in hypothyroidism as it can be a heritable trait. Labradors with a family history of hypothyroidism could, be at a higher risk of developing the condition.


Hypothyroidism can develop at any stage of a dog’s life. It is most common in middle-aged dogs, particularly those between two to eight years old. Labradors in this age range may be more susceptible to developing hypothyroidism.


Certain studies suggest that male Labrador Retrievers may be more susceptible to hypothyroidism and associated conditions like hyperlipidemia than their female counterparts.

Other Health Conditions

Hypothyroidism in Labradors is often linked to other health conditions, such as severe hyperlipidemia and neurological dysfunction. A history of these health issues could indicate a higher risk of hypothyroidism.

Environmental Factors

While the exact cause of hypothyroidism remains unknown, some environmental factors may contribute to its development. These include exposure to toxins or certain medications.

Age Susceptibility to Hypothyroidism in Labradors

Treatment options for hypothyroidism in Labrador Retrievers

Hypothyroidism can affect Labrador Retrievers of all ages, though it is most commonly diagnosed during middle age. Studies indicate that the condition is prevalent among dogs aged two to eight years old. Some sources even narrow down this range further, suggesting that Labradors are most likely to develop hypothyroidism between four to six years of age.

Regardless of age, owners should monitor their Labradors for hypothyroidism symptoms. The presence of these symptoms necessitates a consultation with a veterinarian for a thorough physical examination and diagnostic testing. This could involve an initial screening test for hypothyroidism and further tests to assess thyroid function and hormone levels.

If a dog is diagnosed with hypothyroidism, treatment often involves oral synthetic thyroid hormone replacement, such as levothyroxine. Monitoring thyroid levels and adjusting medication as needed are integral parts of managing this endocrine system disease in dogs.

Treating Hypothyroidism in Labrador Retrievers

The treatment of hypothyroidism in Labrador Retrievers, though a life-long commitment, allows most dogs to lead normal, healthy lives. A detailed treatment plan typically involves:


The journey begins with a thorough physical examination by a veterinarian if hypothyroidism is suspected. The definitive diagnosis usually involves a series of blood tests to measure thyroid hormone levels in the dog’s body. These tests are crucial in differentiating hypothyroidism from other diseases that may mimic it.


Upon confirming the diagnosis, the vet prescribes a synthetic thyroid hormone replacement called levothyroxine. This oral medication compensates for the insufficient hormone production by the dog’s thyroid. Administering this medication becomes a daily routine for the remainder of the dog’s life.


Regular follow-up appointments are essential to monitor the effectiveness of the treatment and adjust the medication dosage if necessary. Through these check-ups, the vet ensures that the thyroid hormone levels are kept within the optimal range, preventing any further complications.

Lifestyle Changes

To supplement medication and enhance the dog’s quality of life, the vet may suggest certain lifestyle changes. These changes could encompass a specially designed diet, a consistent exercise routine, and avoidance of specific toxins or medications that could potentially exacerbate the condition.

Treatment Response in Labradors with Hypothyroidism

Following the initiation of thyroid hormone replacement therapy in Labradors diagnosed with hypothyroidism, it usually takes between 4 to 8 weeks to notice improvement. The timeline for improvement can vary based on the specific symptom.

Observing Changes

Here are some of the expected timelines for symptom improvement:

  1. Hair Regrowth: Often one of the clinical signs of hypothyroidism in dogs is hair loss. The regrowth of hair typically requires a longer period, usually at least 4 months after the start of treatment.
  2. Skin and Ear Problems: Hypothyroidism can cause skin and ear issues in dogs. These conditions might also need a more extended period to heal and sometimes may require additional medications.

Regular Check-ups

It’s essential to ensure regular follow-ups with your veterinarian and periodic blood tests to confirm that the dog is receiving the appropriate level of hormone supplementation. Such follow-ups are crucial to monitor your dog’s progress and adjust the dosage of synthetic thyroid hormone levothyroxine if needed.


As you learned in the article hypothyroidism in Labrador retrievers is common but treatable. This problem often occurs when the thyroid gland is attacked by autoimmune thyroiditis or idiopathic atrophy.

Fortunately, advances in veterinary medicine have made oral thyroid hormone replacement the standard treatment for hypothyroidism. This has helped our beloved dogs live healthier and happier lives. But remember, your observations and actions are vital on this journey.

If you have encountered hypothyroidism in your lab, feel free to share your experience. It may help another dog owner navigate this common health problem in dogs.

Daniel Rowe
Daniel Rowe
Daniel is an experienced writer who specializes in canine topics. He has gained firsthand knowledge from years of research and engagement with dogs. This has given him deep expertise in breed profiles, behavior insights, and more. Fellow dog enthusiasts recognize Daniel for his authoritative content. He is dedicated to sharing reliable and trustworthy information. He is committed to enriching the lives of dog lovers through his writing.
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