Hypothyroidism is a common endocrine disorder in dogs that causes weight gain, lethargy, and skin problems. It is easily managed with daily medication, significantly improving quality of life.
Hypothyroidism causes significant welfare compromise through its pervasive effects on metabolism, energy, skin health, and thermoregulation. Hypothyroid dogs often appear depressed, cold, and lethargic, with poor coat condition and apparent discomfort from skin changes. The tragic welfare aspect is that this is entirely treatable yet often diagnosed only after prolonged suffering due to the subtle and gradual onset of clinical signs. Regular thyroid testing for predisposed breeds from middle age enables earlier diagnosis. Treatment response is dramatic in most cases, with dogs returning to normal energy, weight, and coat condition within weeks. Lifelong medication compliance requires owner education and commitment, as discontinuing levothyroxine returns all clinical signs.