Also known as: Schilddrüsenunterfunktion
Die Hypothyreose ist eine häufige endokrine Erkrankung beim Hund, verursacht durch eine unzureichende Produktion von Schilddrüsenhormon, meist infolge einer immunvermittelten Zerstörung (lymphozytäre Thyreoiditis) oder einer idiopathischen Atrophie der Schilddrüse. Der verringerte Stoffwechsel führt zu Gewichtszunahme, Mattigkeit, Kälteempfindlichkeit sowie Haut- und Fellveränderungen. Sie ist leicht zu diagnostizieren und wird mit lebenslangem Hormonersatz behandelt.
Hypothyroidism is one of the most frequently diagnosed hormonal disorders in dogs, usually affecting middle-aged animals of medium to large breeds. It results from inadequate circulating thyroid hormone, which slows the body's overall metabolism.
Most cases arise from progressive destruction of the thyroid gland, either by immune-mediated lymphocytic thyroiditis or by idiopathic atrophy. Rarely it follows thyroid tumours, congenital defects, or pituitary disease.
Affected dogs typically show weight gain without increased appetite, lethargy, exercise intolerance, and seeking warmth. Skin changes are common: symmetrical hair loss, a dull coat, thickened skin, and recurrent ear or skin infections.
Diagnosis combines clinical signs with blood tests showing low total and free thyroxine (T4) and an elevated thyroid-stimulating hormone (TSH). Concurrent illness can lower thyroid values, so confirmation may require repeat or additional testing.
Treatment is lifelong oral levothyroxine. Dose is adjusted by monitoring blood levels and clinical response. Most dogs improve dramatically within weeks, regaining energy and coat quality.
There is no proven prevention, but early recognition prevents complications. Affected dogs should not be bred because of the heritable autoimmune component.
This content is for educational purposes and is not a substitute for professional veterinary advice. If you are worried about your pet, contact your veterinarian.
