Thursday night I noticed my 4 month old silver Appleyard duck was limping, but only slightly. There was no visible wound, no bumblefoot-type lump or anything. Last night it was worse to the point where she was standing on one leg to keep the pressure off. This morning I kept her confined in the pen and checked her again and I still don't see anything. Nothing appears swollen either. What are the chances that it's sprained or fractured? And how should I treat it?