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"Kidney failure of any type, from any cause, eventually makes affected animals feel lousy.  Dogs suffering from acute renal failure (ARF) usually become sick quickly, but most owners don\u2019t notice the signs of ARF until their faithful companion is seriously ill, because the early stages of this disease are difficult to detect.  At first, the dog will develop non-specific signs of weakness, lethargy and depression, which often go unnoticed even by the most attentive owners. The symptoms progress to gastrointestinal distress and other signs of general illness.  By the time the dog is really obviously sick, more than 75% of its functional kidney tissue is usually damaged. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Acute-Renal-Failure/Symptoms.aspx>