I was looking though pictures that my cuddeback got and noticed that it appears that this cow only has three legs. Looks like the left hind leg is gone just above the knee.
I added another picture with out an elk standing where the stump ? is, I do not see a rock there or that she is straddling somthing. Maybe the leg is behind the other, I would not expect for her to look this healthy if she only had one leg in the back.