A 7 years old female Labrador dog was presented with the history of alopecia with pruritis and inappetance for the past three months. Physical examination revealed bilateral alopecia with hyperpigmentation of skin. Thyroid function tests revealed decrease in T3 and T4 and increase in TSH values and thus indicating hypothyroidism. Haematological and other biochemical parameters were found be within normal limits except leukocytosis. Based on the laboratory findings the animal was treated with Levothyroxine sodium (Eltroxin tab) @20 μg/kg body weight PO, q 12hrs. Application of Ketoconazole (2%) shampoo was advised twice a week for a period of 4 weeks. In addition, vitamins supplement was also advocated. The animal showed dramatic improvement after one month of treatment and complete hair regrowth was noticed after 2 months. The animal returned to euthyroid state after two months of treatment. | Hypothyroidism in a dog - A case report