Understanding Hypothyroidism in Dogs: What Pet Parents Need to Know

At Lonsdale Place Veterinary Clinic, we believe education plays a vital role in your pet’s long-term health. One common condition we often diagnose in middle-aged and older dogs is hypothyroidism, a hormonal disorder that affects metabolism and can lead to a wide range of symptoms. Fortunately, with early diagnosis and proper treatment, dogs with hypothyroidism can live full, healthy lives.  North Vancouver Vet

What is Hypothyroidism?

Hypothyroidism occurs when a dog’s thyroid gland—located in the neck—fails to produce enough thyroid hormone. These hormones play an essential role in regulating metabolism, and when levels are too low, many of the body’s normal functions can slow down. This condition is most commonly caused by autoimmune disease or degeneration of the thyroid gland and is seen more often in medium to large breed dogs such as Golden Retrievers, Dobermans, and Cocker Spaniels.

 North Vancouver Vet

Signs and Symptoms

Because thyroid hormones affect many systems in the body, signs of hypothyroidism can vary widely and often develop gradually. Common symptoms include:

• Lethargy or reduced activity

• Weight gain despite a normal appetite

• Hair thinning or loss, especially on the body and tail

• Dry, flaky skin or chronic skin infections

• Intolerance to cold temperatures

• Frequent ear or skin infections

• Slow heart rate

• Changes in mood or behaviour (such as depression or anxiety)

These signs can easily be mistaken for normal aging, so regular wellness exams are essential to catch issues early.

 North Vancouver Vet

Diagnosis

If hypothyroidism is suspected, we will recommend bloodwork to evaluate thyroid hormone levels, including total T4, free T4, and thyroid-stimulating hormone (TSH). It’s important to interpret these results alongside your dog’s clinical signs, as other illnesses and certain medications can affect hormone levels.

 North Vancouver Vet

Treatment and Monitoring

Hypothyroidism is managed with a daily oral thyroid hormone supplement called levothyroxine. Most dogs respond very well to this treatment, with improved energy, skin condition, and weight stabilization usually seen within a few weeks. Regular follow-up blood tests are necessary to ensure the dosage is appropriate and effective. At Lonsdale Place Veterinary Clinic, we will guide you through this process and adjust treatment as needed to keep your pet feeling their best.

 North Vancouver Vet

Long-Term Outlook

With proper treatment and monitoring, dogs with hypothyroidism can live completely normal lives. This is a lifelong condition, but once diagnosed and managed, the prognosis is excellent.

 North Vancouver Vet

If you’ve noticed changes in your dog’s energy, skin, or weight, don’t hesitate to get in touch. Early intervention can make a big difference in your pet’s quality of life.

Contact us at Lonsdale Place Veterinary Clinic to schedule an exam or learn more about thyroid testing and treatment options.  North Vancouver Vet