Congenital Hypothyroidism

When tiny tabby Lucy came through the Orphan Kitten Club nursery as a baby, the cause of her small stature was a mystery. Standing next to her siblings, she was a fraction of their size and not putting on weight despite eating. After many tests, veterinarians at UC Davis diagnosed her with a rare hormonal disorder that can lead to poor growth, lethargy, seizures, and even death if left untreated.

Blood tests confirmed the diagnosis of congenital hypothyroidism, and Lucy began treatment with an oral medication. With careful monitoring and consistent care, her symptoms improved. She was eventually spayed and adopted into a loving home, where she continues to thrive!

Lucy’s case prompted a dedicated research effort at UC Davis to better understand congenital hypothyroidism in kittens. This ongoing study is working to establish normal thyroid hormone reference ranges and refine treatment protocols, with the goal of helping more kittens be accurately diagnosed and treated. What was once considered rare may be more common than previously understood, particularly in kittens who are failing to grow without a clear cause—and we’re thrilled that her inspiration will give future tiny kittens a chance to survive and thrive.