Hypothyroidism is the most common endocrine disease in dogs, causing weight gain, lethargy, and skin problems that significantly reduce quality of life when untreated.
Hypothyroid dogs often go undiagnosed for years because the signs develop gradually and are attributed to aging. Owners accustomed to their dog's lethargy may not realize the dog has been uncomfortable and energy-depleted. After treatment, the transformation is often dramatic - dogs that had become quiet and withdrawn return to their pre-illness energy and engagement. Routine senior wellness screening catches hypothyroidism before welfare is significantly compromised.