WeGa've had two LS dogs. She may have strained the front leg in trying to pull herself upright without help from her back end. Even without that, the front legs compensate for the back and start having to bear more weight than is optimal, leading to strain. Hope it's nothing worse than that. Gabapentin, tramadol, and Adequan is what has worked at our house. There are other meds you can add if there are no special kidney issues. Hugs to you and Tori.