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Hello, this is Dr. Jess. I am sorry to hear about your kitty's issue. There are several different diseases I worry about in a 15 year old cat who may be losing weight and is drinking water frequently. These diseases include hyperthyroidism, kidney disease, and diabetes. All three of these diseases can cause the symptoms you are describing in Autumn. The only way to diagnose which of these diseases she may have would be to do bloodwork to check the kidney, thyroid,and blood sugar levels. Depending on which disease she may have, there are treatment options for all the diseases, which may include special diets, daily medications, or injections given at home. Here are some articles on the diseases:
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