My very active, happy, and healthy 3 year old pit bull is crying out in pain when touched or moved near buttocks/back hip/leg area. He can't jump on bed, get in my truck or up my steps without my help. When I do assist his back end he whimpers in pain. This started about 24 hours ago. The only thing I can figure is maybe he injured himself. Would him eating a dead rabbit cause any of the mentioned symptoms?