Hypothyroid in Cats

Hypothyroidism, or underactive thyroid, is rare in cats and occurs most often in cats who have had a radioactive iodine treatment or surgery for hyperthyroidism. While it's not life-threatening, hypothyroidism does affect the cat's quality of life. If you suspect that your cat is hypothyroid, ask your veterinarian to do blood tests to check the cat's thyroid levels.

  1. Symptoms

    • The symptoms of hypothyroidism include weight gain; dry, itchy skin and excessive dander; greasy, matted fur; aggression or anxiety; and lack of energy and zest for life.

    Treatment

    • The most common treatment for hypothyroid cats is thyroxine (generic name, levothyroxine), a thyroid hormone supplement. Thyroxine can be compounded into a liquid, soft moist treats or a gel to rub inside an ear tip for cats who are difficult to pill.

    Holistic Treatment

    • Kelp, which contains iodine, helps some hypothyroid cats. Consult a holistic veterinarian for the correct dose for your cat.

    Radioactive Iodine Treatment

    • Less than five percent of cats become hypothyroid after radioactive iodine treatment, according to SouthPaws Veterinary Specialists and Emergency Center.

    Regular Checkups

    • Hypothyroid cats on medication should be monitored regularly to make sure their thyroid values are normal.

    Signs of Improvement

    • Lethargic cats should become more active within a week of beginning treatment. Most hypothyroid cats begin losing excess weight within two to four weeks of starting treatment.