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Key Takeaways from Dr Stephanie Mitze
Hypothyroidism is one of the most commonly encountered endocrine disorders in dogs and cats, but despite its familiarity, it’s often misunderstood and misdiagnosed.
This blog is based on our webinar with Dr Stephanie Mitze, where she breaks down the realities of diagnosing and managing hypothyroidism in both dogs and cats, highlighting why it’s rarely as simple as a low T4 result.
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Why Hypothyroidism Isn’t So Straightforward
Thyroid hormones influence almost every system in the body, from metabolism and skin health to neurological and cardiovascular function.
The challenge?
Hormone levels can be affected by a wide range of factors—including illness, medications, and even breed differences—making interpretation tricky.
The Biggest Challenge: Getting the Diagnosis Right
One of the most important messages from this webinar is:
Not every low T4 equals hypothyroidism
Conditions like euthyroid sick syndrome can mimic hypothyroidism on blood tests, leading to potential misdiagnosis if results are viewed in isolation.
A reliable diagnosis always requires:
- A thorough history
- Careful clinical examination
- Thoughtful interpretation of lab results
What Should Raise Suspicion?
While signs can vary, common indicators include:
- Lethargy and reduced activity
- Weight gain
- Skin and coat changes (especially in dogs)
- Bradycardia
- Exercise intolerance
In cats, signs are often more subtle and can overlap with other conditions like kidney disease.
Testing: Think Beyond a Single Result
No single test gives you the full picture.
In practice, diagnosis often relies on:
- Total T4 (TT4)
- TSH levels
- Clinical presentation
And importantly, understanding what might skew those results.
Treatment & Expectations
Treatment is typically straightforward: lifelong levothyroxine supplementation, but improvement takes time.
- Energy levels may improve within weeks
- Skin and coat changes can take months
- Monitoring and consistency are key
Key Takeaways
✔ Hypothyroidism is common but often overdiagnosed
✔ Always interpret thyroid results alongside clinical signs
✔ Euthyroid sick syndrome is a major diagnostic pitfall
✔ There is no single definitive test in general practice
✔ Treatment is effective but requires patience and long-term management
If you want to feel more confident with Hypothyroidism cases, you can download the full webinar to:
- Deep dive into diagnostic challenges
- Understand how to approach complex cases
- Learn how to avoid common mistakes
- Build confidence in managing hypothyroid patients
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Chris Ellerker
Divisional Director – Dentistry and Locum Vet Divisions
I have over 12 years of recruitment experience, working my way up from Candidate Resourcer, Recruitment Consultant, Business Manager, to Divisional Director. I manage/run our Dentistry and Locum Vet teams here at Prospect Health. I thoroughly enjoy finding candidates a rewarding position that meets their expectations and supporting them through the process of registration/compliance (the fun bit), as well as throughout their placement/booking…