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Thyroid disease is a hormonal disorder that affects cats and dogs in different ways.

Hypothyroidism (Dogs)

  • Thyroid gland does not produce enough hormones
  • Slows down metabolism

Hyperthyroidism (Cats)

  • Thyroid gland produces more hormones than a cat needs
  • Speeds up metabolism
  • Most commonly seen in senior cats

Left untreated, hyperthyroidism can contribute to serious conditions like:

  1. Heart failure
  2. Kidney disease
  3. High blood pressure

States with the highest prevalence of Thyroid Disease

  1. Mississippi
  2. Iowa
  3. Oregon
  4. Colorado
  5. Alabama
  1. Montana
  2. South Dakota
  3. Oregon
  4. Washington
  5. New Mexico


Signs & symptoms of hypothyroidism in dogs.

Hypothyroidism (Dogs)

  • Sleeping more than usual
  • Tiredness
  • Weight gain (often rapid)
  • Seeking out warmth (e.g., sitting by a heat vent)
  • Dry skin
  • Hair loss
  • Discoloration or thickening of the skin where hair loss has occurred
Signs & symptoms of hypothyroidism in cats.

Hyperthyroidism (Cats)

  • Weight loss
  • Diarrhea
  • Vomiting
  • Increased appetite
  • Increased thirst
  • Increased urination
  • Restlessness
  • Matted or greasy coat
  • Unkempt appearance


Successful management of these chronic conditions depends on early diagnosis and treatment. While thyroid disease is relatively easy to diagnose and manage in dogs, the opposite is true for cats, which are famous for hiding illness and discomfort.

Hypothyroidism (Dogs)

  • Regular veterinary examinations to measure hormone levels
  • Oral medication

Hyperthyroidism (Cats)

Because thyroid disease in cats is linked to other serious conditions, it is particularly important that cats be diagnosed and treated early. Fortunately, they have plenty of options:

  • Surgery to remove thyroid gland
  • Radiation treatment
  • Oral medications
  • Nutritional management

Learn more about thyroid disease in cats and dogs at

Only 45% of cat owners know that changes in appetite can be a sign of thyroid disease in cats; and, 4 in 5 cat owners don't know that changes in a cat's coat or urination habits are linked to hyperthyroidism in cats.