A. There are many possible causes of hair losss as I'm sure your veterinarian has explained to you. At 13 years old, your cat is in the right age-range for diseases of the thyroid gland to develop. Itchiness and hair loss can sometimes be a symptom of thyroid disorders. It may be necessary to have a full senior blood work up to check the thyroid levels and overall health of your senior cat. Other causes of hair loss include allergies to fleas and contact dermatitis (allergic to some chemical in the enviroment such as scented cat litter, air freshners, laundry products, floor cleaners, etc). Hair loss is a symptom of a larger problem and can be frustrating to treat. Try to get to the underlying cause.
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