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Koi fish will outlive humans oldest koi is over 200 in Japan but a good live expectancy is 75 years you are very lucky to get a dog to 20 years old. Koi cost $100 for a decent fingerling I can see why you would want to save it. Most expensive Koi in world sold for 1.5 million same price as most expensive dog sold Tibetan Mastiff.
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