Hypothyroidism is a disease caused by insufficient levels or the body's abnormal use of thyroid hormone. In some pets, the pituitary gland is involved, but most cases are due to inadequate production of hormones by the thyroid. Males may have a shrinkage of the testes and show less interest in females.
Blood tests are necessary to diagnose the condition and monitor treatment.
Hypothyroidism is controlled rather than cured, and lifetime therapy is necessary. No significant change in diet is recommended. A good quality food will be fine. You may notice an increase in your pet's activity after therapy has begun. Medication must be given as directed.