I would definitely have her examined by a veterinarian. If you haven't recently changed her diet or exposed her to any possible allergens, then, at 14 her hairloss could be due to an internal problem.
The most common senior cat disease that can cause this type of hairloss is hyperthyroidism. This is an overactive thyroid gland which causes an increase in the cat's metabolism. It is very common and easily treated with either medication or radioactive iodine treatment. It is easily diagnosed with a simple blood test. Owners of hyperthyroid cats often feel that their cats are not sick, because the increased metabolism causes a cat to have lots of energy and a great appetite. It is important to diagnose and treat hyperthyroidism, however, because excess thyroid hormone is toxic to heart muscle and can eventually lead to high blood pressure and heart disease.
Here are a few links for you about hyperthyroidism:
http://maxshouse.com/Hyperthyroidism_in_Cats.htm
http://www.avmi.net/NewFiles/Hyperthyroidism/Hyperthyroidism.html
http://www.fabcats.org/hyperthyroidism.html
Other possible internal causes of hairloss include diabetes or certain cancers. It is also possible that your kitty's skin and hair are just not as healthy as they used to be now that she is a lilttle older. Sometimes older cats benefit from supplementation with fatty acids - something you can easily purchase over the counter. Fish oil and salmon oil are the best sources.
Please do have your cat looked at by a veterinarian - at 14, it is important to rule out any potentially serious causes for her problem.
Best of luck to you and your cat!
Dr. Olivia
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