My daughter has a beautiful pair of whites. They have been doing good, but last night I noticed the mail is a little "gimpy". They are not in an area that damage can happen. Wanted to check and make sure the diet was giving them everything they need. I know in big animals, if they don't have certain elements it can cause bone lameness. So ... what is the best diet for Mandrins ... protien? Thanks ... Oh .. we are in Northern Ohio ... could it be cold related? They are inside a barn, unheated except the goat breath! On straw with a "puddle". 4x4 area covered.