Clinical And Diagnostic Insights Into Hypothyroidism In A Shih-Tzu: A Case Report

March 2026 in “ Indian journal of veterinary and animal sciences research. ”

H.V. Sanjay, S.P. Abhijith, H.J. Apoorva, D. Chandrakumar, A. Abdul Kalam

hypothyroidism alopecia seborrhoeic dermatitis bradycardia hypercholesterolaemia T4 TSH levothyroxine sodium hair loss thyroid hormone thyroid-stimulating hormone Synthroid

TLDR A Shih Tzu with hypothyroidism improved significantly after 6 weeks of levothyroxine treatment.

A 4-year-old neutered female Shih Tzu was diagnosed with primary hypothyroidism, presenting symptoms such as weight gain, lethargy, bilateral symmetrical alopecia, and cold intolerance. Physical examination showed a dull coat, seborrhoeic dermatitis, bradycardia, and mild obesity. Blood tests revealed mild hypercholesterolaemia, low total and free T4 levels, and elevated TSH. Treatment with oral levothyroxine sodium at 20 µg/kg twice daily led to significant clinical improvement within 6 weeks.

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