Your lender is not likely to grant you a short sale solely because the value of your home went down. Real estate values, like the stock market, do fluctuate and a real estate purchase does not come with any guarantee that your value will only go up. Your home is intended to be primarily a place for you to live and secondly, a longer term investment and wealth vehicle. If your sole reason for selling is because your home value went down then you may not qualify for a short sale.
We have learned from experience to never say never so we encourage you to call us to discuss your situation.