Based on the history you provided, below are possible causes for your cat’s weightloss. Not listed but a necessary consideration for possible cause of general weightloss at this advanced age, is systemic cancer. Cancer present virtually anywhere in the body can lead to break down of lean muscle mass, fat and other tissues leading to general weightloss, through a process known as paraneoplastic syndrome. If you still seek further information, please visit our
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My cat also is acting disoriented.and stumbles