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Hi I'm Dr. Carole and I'm a small animal veterinarian. I'm sorry to hear about Beatrice and I hope I can help. There are many things that can cause this. Have you had her feces checked for parasites and have you dewormed her? There is a drug called Panacur that is a very good dewormer that I would suggest. Also, have you done any blood testing? There are many metabolic diseases that can cause diarrhea and weight loss in an older cat especially thyroid disease. In particular cats get hyperthyroidism or an overactive thyroid gland that can cause weight loss even in the face of a good appetite. Cats also get something called inflammatory bowel disease which causes thickening of the intestines and decreased absorption of food and nutrients. This is difficult to diagnose without and ultrasound or intestinal biopsies but often responds well to a special hypoallergenic diet, antibiotics, probiotics and sometimes steroids. Unfortunately some older cats can also get lymphoma or cancer of the intestinal tract that can cause diarrhea. I highly suggest taking her to the veterinarian for a check up and workup with bloodwork and xrays to start. Starting on an antibiotic like Metronidazole and probiotic like Fortiflora and an intestinal diet would be a good starting place. Let me know if I can be of any more help. Thanks
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