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Hello. Thanks for writing in. My name is***** and I would be happy to help you. What has to be determined here is if this is an orthopedic/neurologic problem, such as an injury or arthritis, or a weakness problem due to a metabolic problem. With the excessive drinking, I would be concerned with kidney failure, diabetes, Cushing's disease (adrenal glands - usually has excessive appetite), cancer or liver problems. The skin can be related to any of these issues due to lack of nutrition or immune system problems. In addition to arthritis and an injury, there may be a problem around the spinal cord, such as a disk herniation or a tumor around the spine. The first thing I would recommend doing is to have your vet run some blood work and a urinalysis. If the vet deems necessary from physical exam, they may recommend doing some x-rays of the rear end and spine. Please let me know if you have any other questions or concerns. Hope this helps.
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