It would be nice to see what the nature of surfaces are that are not grass. I have a good number of 5 to 6 lb American Dominiques jumping down about four feet onto 1" gravel without issue. The surface is hard but not likely creating cuts. Are her birds getting essentially hardware disease of the feet by abrading on something not considered like exposed wire?
What breed is involved? Possibly one with feathered feet?
What breed is involved? Possibly one with feathered feet?