After a joyful day of playing in the fresh snow. Fergie came in -- went to bed--woke me up at 4:30 am (unusual for her) to go outside. She came in--hesitated going upstairs, but did come up. Wanted on the bed, then wanted off so I put her on the floor. When I got up this am she was curled up sleeping by the bed, but when we were ready to go downstairs she just couldn't get up. Her back legs just don't seem to work. I took her immediately to the vet. She was x-rayed and the vet thought one set of vertebre had a slightly smaller spacing and thought perhaps there was an injury with swelling. She is on prednisone 20 mg twice a day for two days, then half tablet twice a day for two days and then half tablet once a day for three days. She also has to take an antacid to protect her tummy. She is not to do any activity outside being carried outside to potty. I did not witness any injury--she has a tendancy to play rough with our Leonberger, but still I didn't see or hear anything that made me think something happened. Fergie doesn't seem to be in pain, but it is hard to tell. She has no stregnth in her back legs and holds one off the ground.She still wants to play, but her appetite is down.--Very unusual for her, and she has runny stools. Has anyone experienced something similar.